High Quality Content by WIKIPEDIA articles! Unassigned Lands, or Oklahoma, were in the center of the lands ceded to the United States by the Creek (Muskogee) and Seminole Indians following the Civil War and on which no other tribes had been settled. By 1883 it was bounded by the Cherokee Outlet on the north, several relocated Indian reservations on the east, the Chickasaw lands on the south, and the Cheyenne-Arapaho reserve on the west. The area amounted to 1,887,796.47 acres (2,949 miles² or 7,640 km²). The Treaty of Indian Springs, February 12, 1825, provided for a delegation of Creeks to visit the west in order that "... they may select any other territory, west of the Mississippi, on Red, Canadian, Arkansas, or Missouri Rivers..." to replace their lands in Georgia. A dispute arose between the Lower Creek Council, which signed the treaty, and the Upper Creek Council, which objected.