River Lethe Greek Mythology

River Lethe is located 18 km west of Mount Katmai, Alaska Peninsula, and is the middle branch of the Ukak River. It flows through the Valley of Ten Thousand Smokes and meets the Ukak at 58°23′44″N 155°24′00″W / 58.39556°N 155.40000°W.
Data from: en.wikipedia.org