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Seward Peninsula

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The Seward Peninsula is a massive landform on the western coast of Alaska.

Beringia - present day
Beringia - present day

It projects into the Bering Sea between several bodies of water. These include Norton Sound, the Bering Strait, the Chukchi Sea, and Kotzebue Sound. The peninsula sits just outside the Arctic Circle. It is roughly 280 miles long and 150 miles wide. The name comes from William H. Seward. He was the U.S. Secretary of State who negotiated the purchase of Alaska from Russia in 1867.

This region is a remnant of the Bering land bridge. During the Pleistocene Ice Age, a wide swath of land connected Siberia to mainland Alaska. This land bridge was about 1,000 miles wide. It allowed humans, plants, and animals to migrate from Asia to North America. Archaeologists study sites like the Trail Creek Caves and Cape Espenberg to understand these ancient migrations. These excavations provide a timeline of how life moved across the land bridge. Much of this area is now protected in the Bering Land Bridge National Preserve.

Volcanic activity has created unique geologic features across the peninsula. The northern part contains the Espenberg volcanic field. This field includes the Devil Mountain Lakes. These are the largest maar lakes in the world. A maar is a lake formed by an underground steam explosion. These lakes formed over 21,000 years ago. Other notable volcanic maar lakes include the Killeak Lakes and White Fish Lake. Near Kuzitrin Lake, the Lost Jim Lava Flow covers about 10 square miles. This lava field formed between 1,000 and 2,000 years ago.

The southern side of the peninsula is defined by four mountain ranges. The most prominent is the Kigluaik, also called the Sawtooth Mountains. The highest point in the entire peninsula is Mount Osborn. Other ranges include the Bendeleben, Darby, and York Mountains. The Bendeleben Mountains show evidence of recent faulting. Faulting is when rocks break and move due to pressure. Most mountain formation here happened during the Cretaceous period. This was caused by the rotation of the Bering plate in the Arctic.

Water systems are vital to the peninsula's ecology and its people. Large rivers include the Koyuk, Kuzitrin, Niukluk, and Fish rivers. Other major rivers are the Tubuktilik, Kiwalik, Buckland, and Agiupuk. These rivers support many species of fish. Residents can find salmon, Dolly Varden trout, and Arctic grayling. They also find whitefish, northern pike, and burbot. The rivers follow a seasonal cycle. Most freeze in mid-October and break up in late May.

Tarns in Kigluaik Mts., Seward Peninsula
Tarns in Kigluaik Mts., Seward Peninsula

Human communities are spread across the Nome Census Area and the Northwest Arctic Borough. Nome is the largest community with 3,508 residents. Other towns include Shishmaref, Buckland, Koyuk, and Brevig Mission. There are also smaller towns like Elim, Teller, White Mountain, and Wales. Some locations like Council, Solomon, and Candle were mining towns. These mining towns no longer have year-round residents. The U.S. Air Force operates a radar station at the Tin City site. The U.S. Coast Guard once had a LORAN station at Port Clarence.

Animals and nature also play a major role in the local history. The black spruce is a dominant tree species here. The peninsula marks the westernmost limit for these trees. Reindeer herding also has deep roots in the region. Reindeer were imported from eastern Siberia in 1892. People thought the peninsula's geography would keep reindeer separate from wild caribou. However, in 1997, the reindeer joined the Western Arctic Caribou Herd during migration. This caused the domesticated reindeer to disappear into the wild herd.

The western tip of the peninsula is Cape Prince of Wales. This is the westernmost point on the mainland of the Americas. It is only 55 miles from Cape Dezhnev in Russia. In 2011, Russia announced a plan for a rail tunnel. This tunnel would run under the Bering Strait. It would connect the Seward Peninsula to the Chukchi Peninsula in Russia. The project was estimated to cost $65 billion. If finished, it would be the world's longest tunnel at 43 miles long.

Bering Land Bridge Preserve 95
Bering Land Bridge Preserve 95
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🖼️ Images & Media (3)
File:Beringia - present day.png
Beringia - present day.png
File:Tarns in Kigluaik Mts., Seward Peninsula.jpg
Tarns in Kigluaik Mts., Seward Peninsula.jpg
File:Bering Land Bridge Preserve 95.jpg
Bering Land Bridge Preserve 95.jpg
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