Indigo Lake (Alaska)
 Indigo Lake or simply Indigo is a lake lying ten miles southeast of central Sitka on the western coast of Baranof Island in the Alexander Archipelago of Alaska at 57°00′50″N 135°03′53″W.The name was reported in 1954 by local Sitkan Robert N. DeArmond to the USGS and was so named because its intensely and mysteriously indigo blue color.