The International Selkirk Loop is a 280-mile-long (450 km) scenic highway in the U.S. states of Idaho and Washington, as well as the Canadian province of British Columbia.

The loop encircles the Selkirk Mountain Range, and offers several side trips aside from the main route.

[4] The International Selkirk Loop begins on U.S. Route 2 at the Washington-Idaho state line, in the city of Newport.

While traveling through Ione, WA 20 splits off, and the Loop designation transfers to Washington State Route 31.

The ferry is approximately 5.4 miles (8.7 km) in length, and connects the loop to the eastern shore of the lake.

The highway proceeds southward, running parallel to a large river, continuing to the Canada–US border, where the BC 21 designation terminates.

The route proceeds southeast, intersecting several small roads, and passing west of the Kaniksu National Forest.

The roadway continues westward, traveling parallel to the Pend Oreille River, and intersecting the occasional small road.

The highway continues eastward, crossing over the Pend Oreille River, and reaching the Washington-Idaho state line, where the Loop begins again.