Marsimik La is located about 20 km (10 mi) northeast of Lukung at the tip of Pangong Lake, and 15 km (9 mi) southwest of Pamzal in the Chang Chenmo Valley.

The ridge line of Marsimik La divides the basin of the Pangong Lake from the Chang Chenmo River.

The description of Marsimik La in the Gazetteer of Kashmir and Ladak (1890) states:This pass, though very high, is by no means difficult in summer.

It is free from glaciers, and generally clear of snow during the summer and early autumn.

[2]About 4 km to the east of Marsimik La is another ridge line which divides the western portion of the Pangong Lake basin with the central portion that drains into the lake via the Khurnak Plain.