Rising in the York Mountains, the river empties into the Bering Sea, 10 miles (16 km) west of Port Clarence.
The bed of the river is not deeply gravel filled, and the valley floor is practically cut out of the limestones and not to any extent built on them.
Between Tin Creek aad Lost River, there is a stock of granite intruded into the limestone, which outcrops in a nearly circular area, probably 0.5 miles (0.80 km) in diameter.
[2] In 1898, a party of disappointed prospectors, returning from Kotzebue Sound, were shipwrecked a few miles east of the mouth of Lost River, and were obliged to camp at that point during the winter.
Metallic tin was readily obtained from one small specimen by aid of a blowpipe, while the larger part of the collection was shown to contain minerals of no value.