Yellowstone River

Yellowstone River
Yellowstone Falls on the Yellowstone River in Yellowstone National Park
Map of the Yellowstone River watershed
Location
Country	United States of America
State	Wyoming, Montana, North Dakota
Physical characteristics
Source	Confluence of North and South Forks
• location	Absaroka Range, Wyoming
• coordinates	43°59′18″N 109°55′45″W / 43.98833°N 109.92917°W / 43.98833; -109.92917[1]
Mouth	Missouri River
• location	McKenzie County, near Buford, North Dakota
• coordinates	47°58′42″N 103°58′56″W / 47.97833°N 103.98222°W / 47.97833; -103.98222[1]
Length	692 mi (1,114 km)[1]
Basin size	70,000 sq mi (180,000 km2)[2]
Discharge
• location	Sidney, MT[3]
• average	13,773 cu ft/s (390.0 m3/s)[3]
• minimum	3,108 cu ft/s (88.0 m3/s)
• maximum	159,000 cu ft/s (4,500 m3/s)[4]
Basin features
Tributaries
• left	Gardner River, Shields River
• right	Lamar River, Boulder River, Stillwater River, Big Horn River, Tongue River, Powder River

The Yellowstone River is a tributary of the Missouri River, approximately 692 miles (1,114 km) long, in the Western United States. Considered the principal tributary of upper Missouri, via its own tributaries it drains an area with headwaters across the mountains and high plains of southern Montana and northern Wyoming, and stretching east from the Rocky Mountains in the vicinity of Yellowstone National Park. It flows northeast to its confluence with the Missouri River on the North Dakota side of the border, about 25 miles (40 km) west of Williston.