formed by Victor Slough and Yukon River, 12 mi. SW of Beaver, Yukon Flats.
Locally named for a "sourdough" who had a cabin on the island, as shown on William Yanert's 1916 manuscript map (in Stuck, 1917, map facing p. 122).
Three Sleep Point, Timber Point,
Islands:Oscar Island, Victor Island, Whirlpool Island,
Lakes:Bear Lake, Beaver Lake, Beaver Lake, Beaverdam Lake, Big Grass Lake, Big Lake, Birch Lake, Bubbling Lake, Clam Lake, Duck Lake, Elbow Lake, Fourth Lake, Heart Lake, Hiding Lake, Horseshoe Lake, Lily Lake, Lost Lake, Luke Lake, Marten Lake, North Fork Lake, Otter Pond, Round Lake, Sundown Lake, Sunken Lake, Sweeney Lake, Tincan Lake,
Mountain Passes:Rivers:Streams:Streams:Beaver Slough, Butte Creek, Lost Creek, Nolitna Creek, Victor Slough, Whirlpool Slough,