The Southern Ute Indian Reservation in the State of Colorado is declared to have the following boundaries:
“(1)
Bounded on the north by the southern boundary of the lands—
“(A) ceded to the United States by certain bands of Ute Indians under the Articles of Convention entered into on September 13, 1873, and ratified by the Act approved April 29, 1874 (
18 Stat. 36), and
“(B) described in article I of such Articles of Convention.
“(2) Bounded on the south by the boundary line between the States of Colorado and New Mexico as described in article II of the treaty between the United States and the Ute Indians concluded March 2, 1868, and proclaimed November 6, 1868 (15 Stat. 619).
“(3) Bounded on the west by the eastern boundary of the Ute Mountain Ute Indian Reservation.
“(4) Bounded on the east by the southernmost 15 miles of the eastern boundary of the lands reserved to the Ute Indians by article II of the treaty between the United States and the Ute Indians concluded March 2, 1868, and proclaimed November 6, 1868 (15 Stat. 619), except that the lands east of such boundary in township 32 north, range 1 west, New Mexico principal meridian, that are held by the United States in trust for the benefit of the Southern Ute Indian Tribe are part of the Southern Ute Indian Reservation.