Zanskar is one of the major left bank tributaries of the Indus river.

The other major left bank tributaries of the Indus river are Jhelum, Chenab, Beas & Sutlej.

Its right bank tributaries are Shyok, Gilgit and the Kabul River.

A tributary is a freshwater stream that feeds into a larger stream or river.

A left-bank tributary is a stream that joins the main river on its left side and a right-bank tributary joins it on the right side.