Bering Sea: A Bridge of Ice and History

The Bering Sea covers over 2 million square kilometers and once formed a land bridge connecting Asia to North America. You'll find the world's largest submarine canyon here, along with some of the most productive fisheries on Earth, generating over $5 billion in annual economic output. It's witnessed humanity's earliest migrations, dramatic extinctions, and record-breaking ice loss. Keep exploring, and you'll uncover just how much this remarkable sea still shapes our world today.

Key Takeaways

• The Bering Sea once formed a land bridge called Beringia, which connected Asia to North America before submerging about 11,000 years ago.
• Ancestral Native Americans diverged from Asian populations around 36,000 years ago, with a small founding population crossing between 26,000–19,000 years ago.
• The Diomede Islands, former mountaintops of the ancient Bering land bridge, straddle the U.S.–Russia border and International Date Line.
• Sea ice hit record lows in 2018–2019, dropping to less than half the 1980–2010 average, dramatically reshaping the ecosystem.
• The Bering Sea contains Zhemchug Canyon, the world's largest submarine canyon, driving highly productive upwellings that sustain diverse marine life.

How Big Is the Bering Sea Compared to Other Seas?

The Bering Sea stretches across more than 2 million square kilometers, making it one of the largest bodies of water in the world. When you look at size rankings, it holds the 13th position among global seas. Its ocean boundaries extend 2,400 kilometers east to west and roughly 1,930 kilometers north to south, separating Eurasia from North America.

You'll find it's larger than several well-known bodies of water, including the Gulf of Mexico, the Sea of Okhotsk, the Barents Sea, and the Norwegian Sea. However, it doesn't surpass the Bay of Bengal, the Tasman Sea, or the Gulf of Guinea. The narrowest point sits at the Bering Strait, measuring just 85 kilometers wide, connecting the Bering Sea to the Chukchi Sea. Within its waters, the sea contains 16 submarine canyons, including Zhemchug Canyon, which is recognized as the largest submarine canyon in the world.

The sea was named for Vitus Bering, a Danish explorer who sailed through these waters in the 1700s and helped bring attention to this remote and remarkable region of the world.

What Islands and Canyons Define the Bering Sea's Shape?

Scattered across the Bering Sea, several islands and submarine canyons give this vast body of water its distinctive shape and character.

You'll find the Diomede Islands straddling the U.S.-Russia border in the Bering Strait, with Big and Little Diomede sitting just 2.4 miles apart yet separated by the International Date Line. In winter, a seasonal ice bridge between islands can form, theoretically making it possible to walk between the two countries on foot.

Further south, the Pribilof Islands sit in the central Bering Sea, where nutrient-rich upwellings support massive wildlife colonies, including over a million Crested Auklets.

St. Lawrence Island defines the sea's northern boundary near the Bering Strait, while Russia's Komandorski Islands anchor its western edge.

Below the surface, Zhemchug and Pervenets canyons cut along the continental shelf, driving productive upwellings that sustain the Bering Sea's extraordinary marine biodiversity. The Diomede Islands are actually former mountaintops of the ancient Bering land bridge that once connected Asia and North America.

The Diomede Islands were first visited by Europeans on August 16, 1728, when Danish navigator Vitus Bering arrived on St. Diomede's Day, the feast day that ultimately gave the islands their name.

How Did the Bering Sea's Past as a Land Bridge Shape Human History?

Thousands of years ago, a vast landmass called Beringia stretched across what's now the Bering Sea, connecting Asia to North America and setting off one of history's most consequential migrations. Understanding ice corridor dynamics helps you grasp how human migration unfolded across this subcontinent-sized grassland steppe:

• Beringia emerged roughly 35,700 years ago, later than scientists previously thought
• Ancestral Native Americans diverged from Asian populations around 36,000 years ago
• A small founding population crossed during 26,000–19,000 years ago
• The bridge submerged around 11,000 years ago under rising seas
• DNA evidence confirms reverse migration from Alaska back into North Asia

Even after submersion, humans continued traveling by boats, with Yupik peoples settling both sides of the strait around 3,000 years ago. Researchers discovered this revised timeline by analyzing nitrogen isotope fingerprints in Arctic Ocean sediment samples, tracing when Pacific water could no longer flow across the Bering Strait as the land bridge rose above sea level. Genomic analysis of skeletal remains from ancient individuals excavated near the Kamchatka River revealed that back-migration events occurred twice, approximately 5,000 years ago and again around 1,500 years ago, demonstrating that movement across the Bering region was far more bidirectional than previously understood. Much like Devon Island in the Canadian Arctic, the harsh polar conditions of the Bering region create a polar desert environment that severely limits permanent human settlement even today.

What Whales, Fish, and Seabirds Live in the Bering Sea?

Beneath the Bering Sea's frigid waters, you'll find one of the richest marine ecosystems on Earth, home to an extraordinary range of whales, fish, and seabirds. Whale distributions vary widely — gray whales summer in the northern Bering and Chukchi Seas, while fin whales concentrate along the 200-meter shelf break, five times more abundant in the central than eastern Bering Sea. Beluga whales winter throughout the region, and North Pacific right whales, with fewer than 50 animals remaining, show increasing sightings since 2006. Experts gathered at the Smithsonian National Museum of Natural History in November 2023 to discuss these whales at a scientific symposium.

Fish assemblages include squid north of the Aleutians and high concentrations of *C. marshallae* on the middle shelf. However, declining benthic prey in the Chirikov Basin has forced gray whales to shift their foraging grounds considerably. The sheer productivity of these waters rivals that of other remote yet resource-rich regions, much like the Amazon rainforest confluence near Manaus, where vastly different river systems meet to create a remarkable natural phenomenon.

Why Is the Bering Sea Worth a Billion Dollars a Year in Seafood?

The Bering Sea's seafood industry generates staggering wealth — Alaska's annual wild harvest totals 5 billion pounds, with processors handling 2.7 billion pounds valued at $4.2 billion. The economic impact extends far beyond raw numbers, shaping communities and labor dynamics across the region.

Here's what drives that value:

• BSAI contributes $2.5 billion in annual value added
• Fishermen earn $1.5 billion statewide in ex-vessel value
• BSAI supports 12,125 workers and 10,900 FTE jobs
• Labor income from BSAI fisheries reaches $826 million
• National impact exceeds 100,000 FTE jobs from Alaska seafood

You're looking at an industry generating $5.7 billion in total economic output — making the Bering Sea one of America's most critical seafood regions. Alaska seafood exports reach over 160 countries worldwide, bringing more than $3 billion in export revenue into the U.S. economy annually. Yet the industry is not without vulnerability — between 2022 and 2023, the Alaska seafood industry suffered a 1.8 billion dollar loss, reflecting a 50% decline in profitability driven by rising costs, falling prices, and mounting competition from foreign fisheries.

Which Species Did Explorers Drive to Extinction in the Bering Sea?

Lurking in the frigid waters of the Bering Sea, Steller's sea cow (*Hydrodamalis gigas*) was a massive sirenian — reaching 10 meters long and up to 11 tonnes — closely related to dugongs and manatees. Georg Wilhelm Steller discovered it in 1741, yet hunters exterminated it by 1768.

Steller's sea cow impacts stemmed from two forces. Russian fur traders hunted it directly for meat, fat, and hide. Simultaneously, a devastating kelp otter cascade unfolded: aggressive sea otter hunting collapsed otter populations, triggering kelp forest destruction, and stripping sea cows of their primary food source. Scientists debate which cause dominated, but models suggest kelp forest loss alone could've driven extinction. Together, both pressures made survival impossible for this slow-moving, easily hunted giant.

Records show that between 1743 and 1762, 19 expeditions visited Bering Island and collectively killed 2,466 sea cows, far exceeding the estimated maximum sustainable catch of roughly 17 individuals per year. When explorers first arrived in 1741, the population was estimated at roughly 1,500 individuals, a number too small to withstand the combined pressures of direct hunting and habitat loss.

How Is Climate Change Threatening the Bering Sea Today?

While Steller's sea cow fell to hunters' harpoons, today's Bering Sea faces a slower but no less devastating threat: climate change.

You can see its fingerprints everywhere:

• Sea ice decline hit record lows in 2018–2019, dropping to less than half the 1980–2010 average
• Ocean bottom temperatures exceeded 4°C for the first time in November 2018
• The cold pool nearly vanished in 2018, pushing fish species northward
• The crab collapse closed the snow crab fishery entirely in 2022 after starvation decimated populations
• Salmon returns in the Northern Bering Sea have nearly disappeared

Indigenous communities face existential threats as the fisheries they've depended on for generations vanish beneath warming waters. In early 2019, a series of five strong cyclones entered the Bering Sea, breaking up thin ice and driving it northward, further accelerating the collapse of conditions these communities rely upon.

The human cost is staggering: St. Paul, a remote Aleut community in the Bering Sea, saw its city tax revenues collapse from $2.5 million to just $200,000 following the snow crab crash, leaving the island struggling to fund even basic emergency services.