This would be North Dakota's first national monument, a proposal several tribal nations ​say would preserve the area's indigenous and cultural heritage.

If designated by the Biden administration, the Maah Daah Hey National Monument would encompass 139,000 acres of the Dakota Prairie Grasslands.

A group of North Dakota tribal citizens and conservation advocates are calling on President Joe Biden to make roughly 140,000 acres of undeveloped federal land in western North Dakota into a national monument.