Bering Preserve of Alaska.

The preserve contains craters and lava flows. Sea mammals, such as whales, seals, and walruses, live in the preserve as well as reindeer, bears, wolves, and musk ox. The region also supports about 400 species of plants and more than 150 species of birds. It is administered by the National Park Service.

The Bering Land Bridge National Preserve is one of the most remote national park areas, located on the Seward Peninsula in northwest Alaska. The Preserve is a remnant of the land bridge that connected Asia with North America more than 15,000 years ago. The majority of this land bridge, once thousands of miles wide, now lies beneath the waters of the Chukchi and Bering Seas.

During the glacial epoch this was part of a migration route for people, animals, and plants whenever ocean levels fell enough to expose the land bridge. Archeologists agree that it was across this Bering Land Bridge, also called Beringia, that humans first passed from Asia to populate the Americas. The Preserve's western boundary lies 42 miles from the Bering Strait and the fishing boundary between the United States and Russia.

Called Beringia, the “bridge” was a large plain that was 1,000 miles wide in parts about 13,000 years ago. This land bridge was exposed when earth’s water froze into glacial masses, causing the sea level to fall. When glaciers melted about 10,000 years ago, the sea level rose and covered up the land bridge. The two continents are presently separated by 51 miles of the Bering Strait.