In which U.S. state would you find the Marias River?

The Marias River is a tributary of the Missouri River, approximately 210 mi (338 km) long, in the U.S. state of Montana. It is formed in Glacier County, in North-Western Montana, by the confluence of the Cut Bank Creek and the Two Medicine River. It flows east, through Lake Elwell, formed by the Tiber Dam, then southeast, receiving the Teton River at Loma, 2 mi. (3.2 km) above its confluence with the Missouri.

The river was explored in 1805 by the Lewis and Clark Expedition. Some of the men on the expedition mistook it for the main branch of the Missouri until their subsequent discovery of the Great Falls of the Missouri near Great Falls, Montana. The river was named by Meriwether Lewis after his cousin, Maria Wood. Lewis led a small detachment of men to further explore the Marias River on the Expedition's return trip in 1806 to determine if the river ventured north above the Canadian border, during which Lewis killed a young Blackfoot Indian warrior.

The river was the scene of the 1870 Marias Massacre (a massacre of a friendly band of Piegan Blackfeet Indians by the United States Army in Montana Territory during the Indian Wars). The Marias is a Class 1 river from Tiber Dam to its confluence with the Missouri River for public access for recreational purposes.

The Montana Watershed Coordination Council is an advocate for the river.

The Marias River Bridge was listed on the National Register of Historic Places in 2012.