The Kilchis River is a stream, about 14 miles (23 km) long, near the coast of northwest Oregon in the United States. It drains a mountainous timbered region of about 65 square miles (170 km2) in the Northern Oregon Coast Range west of Portland.

The Northern Oregon Coast Range is the northern section of the Oregon Coast Range, in the Pacific Coast Ranges physiographic region, located in the northwest portion of the state of Oregon, United States. This section of the mountain range, part of the Pacific Coast Ranges, contains peaks as high as 3,710 feet (1,131 m) for Rogers Peak. Forests in these mountains are considered to be some of the most productive timber land in the world. The Central Oregon Coast Range is directly south of this section with the Southern Oregon Coast Range beyond the central range.