Stone Structures in Hisma Mountains are a group of stone structures located in Hisma mountains west of Tabuk in the northern part of Saudi Arabia. This area is rich in stone structures, including various circular stone structures and cairns, along with other historical remnants like Thamudic inscriptions and graffiti. The circular stone structures vary greatly in size, from nearly 140 meters in diameter to just a few meters, and can be either standalone or grouped in overlapping circles.