Lobster Lake in the North Maine Woods was named because its shape resembles the outline of a lobster claw.

The larger eastern arm of the lake extending southward is Big Claw and a smaller western arm is Little Claw.

Lobster Stream connects the northwest corner of the lake to the West Branch Penobscot River 1.4 miles (2.3 km) north of the lake.

[2] Lobster Lake and the river are at a similar elevation; so the West Branch may temporarily reverse flow through Lobster Stream into the lake during peak runoff events from the western Maine highlands along the Canadian border.

The lake has self-sustaining populations of native lake trout and land-locked Atlantic salmon; but brook trout populations are suppressed by competition from yellow perch and white perch.