43 CFR § 47.40
How must properties be described?
June 11, 2020
The description of properties involved in a land exchange must be either:
(a) Based upon a survey completed in accordance with the Public Land Survey System laws and standards of the United States; or
(b) If Public Land Survey System laws and standards cannot be applied, based upon a survey that both:
(1) Uses other means prescribed or allowed by applicable law; and
(2) Clearly describes the property and allows it to be easily located.