Aniakchak National Monument and Preserve - Geothermal Areas

Aniachak National Monument and Aniachak National Preserve by National Parks Service

Surprise Lake lies along the northeast caldera wall inside the caldera. Most water draining into the western shores of the Lake is somewhat thermally influenced. However, the warmest waters are still well below 80F, warm compared to the other runoff but not very warm for humans.