The Rural Municipality of Mankota No. 45 is a rural municipality (RM) in the Canadian province of Saskatchewan within SARM Division No. 3. Located in the southwest portion of the province, it is adjacent to the United States border, neighbouring Valley County and Phillips County in Montana.

Valley County is a county in the U.S. state of Montana. Valley County was created in 1893 with area partitioned from Dawson County. As of the 2020 census, the population was 7,578. Its county seat is Glasgow. It is located on the Canada–United States border with Saskatchewan.