Okla. Admin. Code § 710:70-7-2
The following words and terms, when used in this Subchapter, shall have the following meaning, unless the context clearly indicates otherwise:
"Indian country" means:
(A)Land held in trust by the United States of America for the benefit of a federally recognized Indian tribe or nation;
(B)All land within the limits of any Indian reservation under the jurisdiction of the United States Government, notwithstanding the issuance of any patent, including rights-of-way running through the reservation;
(C)All dependent Indian communities within the borders of the United States whether within the original or subsequently acquired territory thereof, and whether within or without the limits of a state; and,
(D)All Indian allotments, the Indian titles to which have not been extinguished, including individual allotments held in trust by the United States or allotments owned in fee by individual Indians subject to federal law restrictions regarding disposition of said allotments and including rights-of-way running through the same. [68 O.S. § 348(3) ]
Okla. Admin. Code § 710:70-7-2