Ross Sea
🏔️ Overview
The Ross Sea is one of the most remarkable marine environments on Earth, forming a vast embayment of the Southern Ocean along the coast of Antarctica. Bordered by Victoria Land to the west, Marie Byrd Land to the east, and the immense Ross Ice Shelf to the south, it serves as the gateway to some of Antarctica’s most spectacular mountain ranges, glaciers, volcanoes, and wildlife habitats.
Covering approximately 960,000 square kilometers (370,000 square miles), the Ross Sea is often called “the Last Ocean” because it remains one of the least disturbed marine ecosystems on the planet. Its cold, nutrient-rich waters support an extraordinary diversity of wildlife, including penguins, seals, whales, Antarctic toothfish, and countless seabirds. In recognition of its ecological importance, much of the sea was designated as the Ross Sea Marine Protected Area (MPA) in 2016—the largest marine protected area in the world.
The sea also occupies a special place in the history of Antarctic exploration. During the Heroic Age of Antarctic Exploration, it served as the departure point for expeditions led by James Clark Ross, Carsten Borchgrevink, Robert Falcon Scott, Ernest Shackleton, and Roald Amundsen. Many of the continent’s most famous historic sites—including Cape Adare, Ross Island, McMurdo Sound, and Hut Point—lie along its shores.
For mountain enthusiasts, the sea offers breathtaking scenery. The coastline is framed by the Transantarctic Mountains, including the towering Admiralty Mountains, Victory Mountains, Royal Society Range, and Prince Albert Mountains. Dominating the southern horizon is Mount Erebus, Antarctica’s highest active volcano, whose persistent lava lake has made it one of the world’s most intensively studied volcanoes.
Massive outlet glaciers descend from the East Antarctic Ice Sheet into the sea, while floating ice tongues and towering icebergs drift through its frigid waters. Along the western coastline, the Ross Ice Shelf—the largest ice shelf in Antarctica by area—extends hundreds of kilometers into the sea, creating one of the most iconic landscapes on the continent.
Today, the sea remains one of Antarctica’s most important destinations for scientific research. International research stations along its shores study climate change, marine biology, glaciology, volcanology, and oceanography, helping scientists better understand the rapidly changing polar environment.
🏔️ Field Guide Tip: The Ross Sea is one of the few places in Antarctica where you can experience towering mountain ranges, active volcanoes, massive glaciers, historic expedition sites, and abundant wildlife—all within a single region. It is truly the heart of Antarctic exploration.
⚡ Fast Facts
| Fact | Information |
|---|---|
| Continent | Antarctica |
| Ocean | Southern Ocean |
| Area | ~960,000 km² (370,000 sq mi) |
| Maximum Depth | Approximately 3,000 m (9,840 ft) |
| Southern Boundary | Ross Ice Shelf |
| Western Boundary | Victoria Land |
| Eastern Boundary | Marie Byrd Land |
| Named By | Sir James Clark Ross |
| Year Named | 1841 |
| Named For | Sir James Clark Ross |
| Largest Protected Area | Ross Sea Marine Protected Area |
| Established | 2016 |
| Famous Landmarks | Ross Ice Shelf, Ross Island, Cape Adare, McMurdo Sound |
| Major Volcano | Mount Erebus |
| Best Time to Visit | December–February (Antarctic summer) |
| Managed By | Antarctic Treaty System & CCAMLR |
📍 Location
The Ross Sea lies in the southern Pacific sector of the Southern Ocean, occupying a broad embayment between Victoria Land and Marie Byrd Land.
Its boundaries include:
- Victoria Land to the west
- Marie Byrd Land to the east
- Ross Ice Shelf to the south
- The open Southern Ocean to the north
Several important geographic features are located along its coastline, including:
- Ross Island
- Cape Adare
- McMurdo Sound
- Terra Nova Bay
- Franklin Island
- Coulman Island
- Beaufort Island
The western shoreline is dominated by the northern Transantarctic Mountains, where glaciers descend directly into the sea, creating one of Antarctica’s most dramatic coastal landscapes.
📏 Size & Physical Characteristics
The Ross Sea is one of the largest embayments surrounding Antarctica and contains an exceptional variety of marine and glacial environments.
Key characteristics include:
- Surface area of approximately 960,000 km² (370,000 sq mi)
- Maximum depths approaching 3,000 meters (9,840 feet)
- Extensive seasonal sea ice
- Floating ice tongues extending from outlet glaciers
- Large tabular icebergs calved from the Ross Ice Shelf
The sea floor includes deep basins, submarine ridges, and continental shelf areas that support highly productive marine ecosystems.
Along the western coast, towering mountain ranges rise directly from the shoreline. Peaks in the Admiralty Mountains, Victory Mountains, and Royal Society Range create a spectacular backdrop, while Mount Erebus dominates the southern skyline from Ross Island.
The interaction between ocean currents, sea ice, glaciers, and mountains makes the Ross Sea one of the most dynamic and scientifically important environments in the polar regions.
🪨 Geology & Oceanography
The Ross Sea occupies a broad continental shelf that was formed through millions of years of tectonic activity, volcanic eruptions, and glacial erosion. Although it appears as a simple embayment on a map, it is one of the most geologically complex marine regions in Antarctica.
Geological History
The Ross Sea lies adjacent to the Transantarctic Mountains, which separate East and West Antarctica. The mountains were uplifted over millions of years through tectonic processes associated with the breakup of the ancient supercontinent Gondwana.
As Antarctica became increasingly glaciated, massive ice sheets repeatedly advanced across the continental shelf, carving deep troughs into the seabed and transporting enormous volumes of rock and sediment into the ocean. These glaciers helped shape the modern sea basin and continue to influence its coastline today.
The Ross Ice Shelf
The southern boundary of the Ross Sea is defined by the Ross Ice Shelf, the largest ice shelf in Antarctica by area.
Covering approximately 487,000 square kilometers (188,000 square miles), the floating ice shelf is fed by numerous glaciers flowing from both East and West Antarctica. As glaciers reach the ocean, they merge into the shelf before eventually calving giant tabular icebergs that drift northward into the Ross Sea.
The Ross Ice Shelf plays a critical role in regulating the flow of inland glaciers and helps stabilize large portions of the Antarctic Ice Sheet.
Ocean Currents
The Ross Sea is driven by a complex system of ocean currents that circulate cold, nutrient-rich water throughout the region.
These currents help:
- Transport oxygen-rich water into the deep ocean.
- Circulate nutrients that fuel marine ecosystems.
- Influence the formation and melting of sea ice.
- Affect global ocean circulation through the production of Antarctic Bottom Water.
The sea is one of the world’s most important sources of Antarctic Bottom Water, a dense mass of cold seawater that sinks to the ocean floor and helps drive the planet’s global thermohaline circulation.
Sea Ice
Sea ice dominates the Ross Sea for much of the year.
During winter, ice expands across most of the sea, creating one of the largest seasonal sea-ice systems on Earth. During the austral summer, much of this ice melts or breaks apart, opening areas of open water known as polynyas.
The Ross Sea Polynya is among the most productive marine ecosystems in Antarctica, supporting enormous blooms of microscopic phytoplankton that form the foundation of the region’s food web.
🌿 Flora & Fauna
The Ross Sea is widely regarded as one of the healthiest marine ecosystems remaining on Earth. Its cold, nutrient-rich waters support an extraordinary diversity of wildlife, much of it found nowhere else in such abundance.
Phytoplankton
Every summer, microscopic algae and phytoplankton flourish as sunlight returns to Antarctica.
These tiny organisms form the base of the Ross Sea food chain, supporting:
- Antarctic krill
- Copepods
- Fish
- Squid
- Seabirds
- Marine mammals
Fish
The Ross Sea contains more than 90 species of fish adapted to freezing waters.
Notable species include:
- Antarctic Toothfish
- Antarctic Silverfish
- Icefish
- Dragonfish
Many possess specialized antifreeze proteins that prevent their blood from freezing in subzero seawater.
Penguins
The sea supports several iconic penguin species.
Common residents include:
- Adélie Penguin
- Emperor Penguin
Cape Adare, Cape Hallett, and Ross Island host some of the largest Adélie Penguin colonies in Antarctica, while Emperor Penguins breed on stable sea ice throughout the region.
Seals
Several seal species depend on the Ross Sea.
These include:
- Weddell Seal
- Leopard Seal
- Crabeater Seal
- Ross Seal
Leopard Seals are among Antarctica’s top marine predators, feeding on penguins, fish, and other seals.
Whales
Whales migrate into the Ross Sea during the Antarctic summer to feed.
Species include:
- Killer Whale (Orca)
- Antarctic Minke Whale
- Humpback Whale
- Blue Whale (occasionally)
The Ross Sea’s rich marine productivity provides abundant food during the short summer feeding season.
Birds
Additional seabirds include:
- South Polar Skua
- Snow Petrel
- Antarctic Petrel
- Wilson’s Storm Petrel
- Southern Giant Petrel
Many nest along the rocky coastline of Victoria Land and nearby islands.
🥾 Exploration & Visiting the Ross Sea
The area has played a central role in Antarctic exploration for more than 180 years.
Heroic Age of Antarctic Exploration
Many of Antarctica’s greatest explorers worked along the Ross Sea coast.
Among them were:
- Sir James Clark Ross, who discovered the sea in 1841.
- Carsten Borchgrevink, whose Southern Cross Expedition established the first overwintering camp on the Antarctic mainland at Cape Adare.
- Robert Falcon Scott, whose Discovery and Terra Nova expeditions operated from McMurdo Sound.
- Ernest Shackleton, whose Nimrod Expedition pioneered exploration of the region.
- Roald Amundsen, who departed from the Ross Sea before becoming the first person to reach the South Pole.
Historic huts from several of these expeditions remain preserved today and are protected under the Antarctic Treaty System.
Scientific Research
Today, the Ross Sea supports some of Antarctica’s most important research stations, including:
- McMurdo Station (United States)
- Scott Base (New Zealand)
- Mario Zucchelli Station (Italy)
- Jang Bogo Station (South Korea)
Scientists conduct research in:
- Marine biology
- Oceanography
- Climate science
- Glaciology
- Volcanology
- Ecology
Tourism
The Ross Sea is among Antarctica’s least-visited tourist destinations due to its remote location and heavy sea ice.
Expedition cruises occasionally visit:
- Cape Adare
- Ross Island
- McMurdo Sound
- Franklin Island
- Terra Nova Bay
These voyages typically occur during the Antarctic summer and often include opportunities to observe penguins, whales, seals, glaciers, and historic expedition sites.
🌤️ Best Time to Visit
The Ross Sea is most accessible during the Antarctic summer, from late November through February.
During this period:
- Sea ice retreats enough for ice-strengthened expedition vessels to navigate portions of the region.
- Daylight extends for nearly 24 hours.
- Wildlife is at its most active.
- Penguins are nesting and raising chicks.
- Whales migrate into the region to feed.
- Scientific fieldwork reaches its peak.
Even during summer, weather remains unpredictable.
Visitors should expect:
- Temperatures generally between −10°C and 2°C (14°F to 36°F)
- Strong katabatic winds
- Rapidly changing sea-ice conditions
- Occasional storms that may alter expedition itineraries
Because of its remoteness, reaching the Ross Sea remains one of the most exclusive Antarctic travel experiences.
🏔️ Field Guide Tip
One of the best ways to appreciate the Ross Sea is to view it as the meeting point of Antarctica’s greatest natural forces. Here, towering mountains, vast glaciers, floating ice shelves, rich marine ecosystems, and centuries of exploration history come together in one extraordinary landscape. Few places on Earth better illustrate the interconnected relationship between the ocean, ice, mountains, and wildlife than the sea.
🧭 Nearby Mountains & Attractions
The Ross Sea is surrounded by some of Antarctica’s most iconic natural landmarks, from towering mountain ranges and active volcanoes to historic expedition sites and world-renowned wildlife colonies. Together, they make the sea one of the continent’s most fascinating regions to explore.
Ross Ice Shelf
Forming the southern boundary of the sea, the Ross Ice Shelf is the largest ice shelf in Antarctica by area, covering nearly 487,000 square kilometers (188,000 square miles). Its towering ice cliffs and enormous tabular icebergs are among the defining features of the Antarctic landscape.
Victoria Land
Stretching along the western shore of the sea, Victoria Land is one of Antarctica’s premier mountain regions. It encompasses numerous ranges within the Transantarctic Mountains, including the Admiralty Mountains, Victory Mountains, and Deep Freeze Range, as well as important scientific research stations and historic exploration sites.
Admiralty Mountains
The Admiralty Mountains rise dramatically above the northern Ross Sea coast. Home to Mount Minto (4,166 m / 13,668 ft)—the highest peak in northern Victoria Land—the range is characterized by rugged granite summits, extensive glaciers, and spectacular alpine scenery.
Mount Erebus
Standing 3,794 meters (12,448 feet) on Ross Island, Mount Erebus is Antarctica’s highest active volcano and one of only a handful of volcanoes on Earth with a long-lived lava lake. It dominates the skyline of the southern Ross Sea and has been a focus of volcanological research for decades.
Ross Island
Located near the southern end of the sea, Ross Island is home to Mount Erebus, Mount Terror, McMurdo Station, and Scott Base. It also contains several of the best-preserved huts from the Heroic Age of Antarctic Exploration.
Cape Adare
Situated at the northern entrance to the Ross Sea, Cape Adare is famous for its historic expedition huts and one of the world’s largest Adélie Penguin colonies. It was the site of the first successful overwintering on the Antarctic mainland.
McMurdo Sound
One of Antarctica’s best-known coastal waterways, McMurdo Sound has served as the gateway for numerous scientific expeditions and historic journeys to the South Pole. Today, it remains the logistical center of Antarctic research.
Terra Nova Bay
Located along the western coast, Terra Nova Bay hosts Mario Zucchelli Station (Italy) and Jang Bogo Station (South Korea). The bay is known for its persistent polynya, rich marine life, and spectacular mountain scenery.
Franklin Island
Rising from the northern Ross Sea, Franklin Island is an uninhabited volcanic island that supports breeding colonies of Adélie Penguins, seabirds, and seals.
💡 Fun Facts
- 🌊 It is often called “The Last Ocean” because it remains one of the least-altered marine ecosystems on Earth.
- 🐧 It supports some of the world’s largest colonies of Adélie Penguins and important breeding sites for Emperor Penguins.
- 🧊 The Ross Ice Shelf regularly calves enormous tabular icebergs, some measuring hundreds of square kilometers.
- 🌋 Mount Erebus, overlooking the sea, contains one of the few persistent lava lakes on Earth.
- 🐋 The Ross Sea Marine Protected Area, established in 2016, is the largest marine protected area in the world.
- ❄️ The region produces vast quantities of Antarctic Bottom Water, a key driver of global ocean circulation.
- ⚓ Many of the greatest Antarctic expeditions—including those of Scott, Shackleton, and Amundsen—used the Ross Sea as their base of operations.
- 🦭 The Ross Sea is one of the best places in Antarctica to observe Weddell Seals, Leopard Seals, Orcas, and Antarctic Minke Whales.
❓ Frequently Asked Questions
Where is the Ross Sea?
The Ross Sea is a large embayment of the Southern Ocean located between Victoria Land in East Antarctica and Marie Byrd Land in West Antarctica.
Why is the Ross Sea important?
The Ross Sea is one of the world’s healthiest marine ecosystems and plays a vital role in global ocean circulation, Antarctic wildlife conservation, and scientific research. It also holds great historical significance as the starting point for many famous Antarctic expeditions.
Why is it called “The Last Ocean”?
Scientists often refer to the Ross Sea as “The Last Ocean” because it remains one of the least disturbed large marine ecosystems on Earth, with relatively intact food webs and abundant populations of top predators.
Can tourists visit the Ross Sea?
Yes, although opportunities are limited. Specialized expedition cruises visit the Ross Sea during the Antarctic summer, stopping at locations such as Cape Adare, Ross Island, and McMurdo Sound when sea ice conditions permit.
What animals live in the Ross Sea?
The Ross Sea is home to:
- Adélie Penguins
- Emperor Penguins
- Weddell Seals
- Leopard Seals
- Crabeater Seals
- Ross Seals
- Killer Whales (Orcas)
- Antarctic Minke Whales
- Antarctic Toothfish
- Numerous seabirds and fish species
What is the Ross Sea Marine Protected Area?
Established in 2016, the Ross Sea Marine Protected Area covers approximately 2.06 million square kilometers (795,000 square miles), making it the largest marine protected area in the world. It was created to conserve one of Earth’s most pristine ocean ecosystems while allowing carefully managed scientific research.
🔗 Related Guides
Continue exploring Antarctica with these Mountain Field Guide articles:
📚 Sources
- Encyclopaedia Britannica. Ross Sea. https://www.britannica.com/place/Ross-Sea
- National Geographic Society. Ross Sea. https://education.nationalgeographic.org/resource/ross-sea/
- Scientific Committee on Antarctic Research (SCAR). Composite Gazetteer of Antarctica. https://data.aad.gov.au/aadc/gaz/scar/
- British Antarctic Survey. Discovering Antarctica. https://discoveringantarctica.org.uk/
- Commission for the Conservation of Antarctic Marine Living Resources (CCAMLR). Ross Sea Region Marine Protected Area. https://www.ccamlr.org/
- Antarctic Treaty Secretariat. The Antarctic Treaty. https://www.ats.aq/
🏔️ Field Guide Tip
The Ross Sea is far more than a remote stretch of polar ocean—it is the crossroads of Antarctica’s natural and human history. Surrounded by soaring mountain ranges, active volcanoes, vast glaciers, and legendary exploration sites, it offers an unparalleled glimpse into the forces that have shaped the southernmost continent. Whether viewed from the deck of an expedition ship or studied through decades of scientific research, the Ross Sea remains one of the most extraordinary places on Earth.
