Beringia

One of the world's great ancient crossroads, Beringia's geographic area is defined as the land and maritime area bounded on the west by the Lena River in Russia; on the east  by the Mackenzie River in Canada; the Chukchi Sea on the north; and on the south by the tip of the Kamchatka Peninsula. 

The shared natural and cultural resources of Beringia provide significant evidence that the  North American and Asian Continents were once connected.