The city gets its water supply from Alma Lake, which is perched above the city on the northeast, held back by a tall earthen dam that blocks Little Frog Bayou. Alma Lake is the reservoir that supplies the city's tap water. Alma sits along the border between the Boston Mountains and the Arkansas River Valley, so while most of the city lies on flat land, immediately to the north is scenic hill country. Alma is surrounded by several rural towns, including Rudy to the north, Dyer and Mulberry to the east, and Kibler to the southwest.