Selinsing Bay is shallow and forms the entrance to the Sungai Sangga Besar, the main approach to Port Weld, and the SungaiSelinsing. The bay is bounded by Tanjong Pasir to the N, and a point about 3 miles SW.
Tanjong Pasir may be recognized by the sandy beaches on the N and S sides of it. The shores of the bay are fringed with wide, drying mud banks which reduce the width of the channels into the two rivers to 0.75 mile and the two separate river channels to 0.25 mile.
The main bar at the entrance to Selinsing Bay lies close S of Tanjong Pasir with depths of from 0.3 to 0.6m.