The 25-mile long Dosewallips River begins as two forks near Mount Anderson, which then join about five miles from the headwaters. The name Dosewallips comes from a Twana Indian myth about a man named Dos-wail-opsh who was turned into a mountain at the river's source. There are also Klallam legends about the "Great Changer", Doquebatl, who transformed a mythical Klallam chief into a mountain at the headwaters of the Dosewallips River. Two species listed under the federal Endangered Species Act, Puget Sound chinook and Hood Canal summer chum, reside in the river.