Claim: The 17-mile Kasilof River starts at Tustumena Lake, Alaska's eighth largest lake with a depth of 950 feet, and flows to Cook Inlet in South-Central Alaska.
Evidence: 17 miles (27 km) It begins at Tustumena Lake and flows northwest to Cook Inlet near Kasilof. Cook Inlet (Dena'ina: Tikahtnu, Russian: Залив Кука) stretches 180 miles (290 km) from the Gulf of Alaska to Anchorage in south-central Alaska. At 73,437 acres Tustumena Lake is Alaska's eighth largest lake and the largest lake on the Kenai Peninsula. With a maximum depth of 950 feet, Tustumena Lake is exceptionally deep; it is deeper than Cook Inlet.