What does RRN mean in Geology?

Red River of the North

The Red River is a North American river. Originating at the confluence of the Bois de Sioux and Otter Tail rivers between the U.S. states of Minnesota and North Dakota, it flows northward through the Red River Valley, forming the border of Minnesota and North Dakota and continuing into Manitoba, Canada. It empties into Lake Winnipeg, whose waters join the Nelson River and ultimately flow into the Hudson Bay, which is considered part of the Arctic Ocean. The Red River flows through several urban areas along its path, including those of Fargo-Moorhead and Grand Forks in the United States and Winnipeg in Canada. The Red is about 885 kilometres long, of which about 635 kilometres are in the United States and about 255 kilometres are in Canada. The river falls 70 metres on its trip to Lake Winnipeg where it spreads into the vast deltaic wetland known as Netley Marsh. In the United States, the Red River is sometimes called the Red River of the North, to distinguish it from the Red River that is a tributary of the Atchafalaya River, and that forms part of the border between Texas and Oklahoma.

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