B e r i n g i a .
  As a result of  ice masses enlargement and lowering of the World Ocean level the territory between Chukotka and Kamchatka became free of water. In place of the Beringov strait the huge band of  dry land was formed, its width reached 2 000 kms. The scientists named this territory Beringia.
  At the stretch of the Ice Age Beringia was the original bridge by which the plants, animals and Humans moved to the Northern America from Asia. This bridge disappeared under water about 10 thousand years ago when the glaciers  thew.

The first Americans
Migrations of animals

Mammoths in America
American bison