The De Long Strait (пролив Лонга; Proliv Longa) separates Wrangel Island from the Siberian mainland. It is very broad, its minimum width being 141 km, between Cape Blossom at the southwestern tip of Wrangel Island and Cape Billings, close to Gytkhelen, Chukotka.

Technically, more than a strait in the proper sense of the name, the De Long Strait is a geographic landmark separating the East Siberian Sea from the Chukchi Sea.

This strait was named after Lieutenant Commander George W. DeLong.

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