A land bridge.
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Lower sea levels and most of the Earth's water being frozen allowed the land bridge to form over what is now the Bering Strait. It is believed, the bridge was formed over 10,000 years ago.
About 25 to 40 thousand years ago, the Ice Age began and the land bridge between present day Alaska and Asia formed.
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A land bridge does not separate places. A land bridge connects them.
land bridge
A land bridge. An Isthmus.
Beringia formed a land bridge between Asia and North America around 20,000 to 10,000 years ago during the last Ice Age. This land bridge allowed the migration of humans and animals between the two continents.
If you are referring to the Bering strait land bridge, it wasn't made but was part of the earth. It was an ice bridge.
The Bering Land Bridge.
Bridges is the plural form of bridge.