Emerald Lake is a freshwater lake located on the western region of the Alpine Lakes Wilderness, in King County, Washington.

Emerald Lake and its surrounding lakes and peaks are a popular area for hiking, swimming, and fishing cutthroat trout and rainbow trout.

[1] Self-issued Alpine Lake Wilderness permit required for transit within the Necklace Valley area.

The lakes form a topographic sequence that reminds of a necklace, hence the name makes reference to a necklace strung with streams in between.

[4] This King County, Washington state location article is a stub.