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Shonkin Sag
The Shonkin Sag is a prehistoric fluvioglacial landform located along the northern edge of the Highwood Mountains in the state of Montana in the United States. The Sag is a river channel formed by the Missouri River and glacial meltwater pouring from Glacial Lake Great Falls. It is one of the most famous prehistoric meltwater channels in the world.〔Axline, Jon and Bradshaw, Glenda Clay. ''Montana's Historical Highway Markers.'' Rev. ed. Helena, Mont.: Montana Historical Society, 2008, p. 91.〕
==Location and size==
Shonkin Sag is located in central Montana. It begins south of Highwood, Montana, (about east of the city of Great Falls) and runs in an easterly direction for about until it reaches the Judith River.〔"Societies and Academies: Geological Society of Washington." ''Science.'' May 7, 1895, p. 559-560.〕 It varies from to in width〔 and is about deep.〔(Calhoun, Fred H.H. ''The Montana Lobe of the Keewatin Ice Sheet.'' Washington, D.C.: Government Printing Office, 1906 ), p. 40.〕〔 Its midpoint is located at approximately . Shallow glacial lakes may still be found along the now-dry channel.〔McRae, W.C. and Jewell, Judy. ''Montana.'' Berkeley, Calif.: Avalon Travel, 2009, p. 398; Spomer, Ron. ''Big Game Hunter's Guide to Montana.'' Belgrade, Mont.: Wilderness Adventures Press, 2005, p. 297.〕
The sag is named for the town of Shonkin, Montana, settled in the 1870s. The name "Shonkin" is allegedly the Blackfeet word for the Highwood Mountains, or an adulteration of one of the town's early settlers, John Shonk.〔Aarstad, Rich; Arguimbau, Ellen; Baumler, Ellen; Prosild, Charlene L.; and Shovers, Brian. ''Montana Place Names from Alzada to Zortman.'' Helena, Mont.: Globe Pequot, 2009, p. 242.〕
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