The Koyukuk River is a major river located in central Alaska, flowing approximately 400 miles through the Yukon-Koyukuk Census Area. It originates from the Koyukuk National Wildlife Refuge and eventually merges with the Yukon River. The river is known for its scenic beauty and diverse wildlife, making it an important habitat for various species. The Koyukuk River is significant for both ecological and cultural reasons. It serves as a vital resource for local communities, providing opportunities for fishing, hunting, and transportation. The river's watershed supports a rich ecosystem, including salmon, moose, and numerous bird species, contributing to the region's biodiversity.