The Aner River is the longest right bank tributary of the Tapi. It rises at an elevation of 600 m at north latitude of 21°23' and an east longitude of 75°45' from the southern slopes of the Satpura hills and traverses in a generally south-westerly direction for a distance of 94 km to join the Tapi from the right, south of Hol. The drainage area of the Aner River is 1,702 sq. km.