A portion of Tagish Lake (on the left half of the image) during the Winter, as seen from space. Windy Arm is in the upper left corner, while the Taku Arm is on the right centre. The lake seen on the right half of the image is Atlin Lake.
It has two arms, the Taku Arm in the east which is very long and mostly in British Columbia and Windy Arm in the west, mostly in Yukon. The Klondike Highway runs along Windy Arm south of Carcross. Bennett Lake flows into Tagish Lake, so the northern portion of Tagish Lake was part of the route to the Klondike used by gold-seekers during the Klondike Gold Rush.