Beringia: A region between Western Siberia and Northern America, which includes the Bering land bridge. Mainly Asian people and animals used the bridge to migrate over to North America. The Bering bridge is roughly 1000 miles long. It is assumed that the Bering land bridge brought present-day Alaska and Eastern Russia together at many times during the ice ages.
Here is a picture of a map of the Bering land bridge to show the area where it was and how far it really stretched.