Atlin Lake

Atlin Lake (Tlingit: Áa Tlein) is the largest natural lake in the Canadian province of British Columbia. The lake is 6.44 kilometres (4.00 mi) wide and 137 kilometres (85 mi) long. The northern tip of the lake is in the Yukon, as is . However, most of the lake lies within the Atlin District of British Columbia. Atlin Lake is generally considered to be the source of the Yukon River. However, it is drained via the short Atlin River into Tagish Lake. Atlin Lake was named by the Tlingit First Nation people of the region.

The name comes from Áa Tlein (in Canadian spelling  Tłèn), the Tlingit name meaning simply "big lake".

The community of Atlin is located on the eastern shore of the lake. The southern part of the lake is in the Atlin Provincial Park and Recreation Area.