A trapezoid-shaped basalt outcropping, known as Mount Khajeh, rises up as an island in the middle of which used to be Hāmūn Lake and the northeastern edge of Hāmūn-e Helmand. Its flat-topped peak rises up 609 meters above sea level with a diameter 2-2.5 km, being the only remaining natural uplift in the Sīstān flatlands.