The outer edges of the mud banks extending from the entrance points of the bay are steep-to, having depths of 18.3 to 20.1m within 0.5 mile of the 5m curve in places; these mud banks should be given a wide berth. Fishing enclosures may be seen on the shallow banks in various parts of the bay.
Outside Teluk Kualacenaku, the flood current sets to the S and ebb to the N.
In the bay, to about 4 miles from the shore, the flood sets to the W, S of Tanjung Dato, and continues from S to SW between Pulau Busung (Boesoeng) and Pulau Jawang (Tjawang) into Batang Toeaka, but S of Pulau Busung this current sets SW into Batang Terboeng.
The flood also sets SW, or on to the NE edge of the 5m curve, 9 miles S of Tanjung Dato. The ebb from abreast Pulau Busung sets to the N and then continues to the E along the coast to the S of Tanjung Dato. In the middle of the bay, the ebb sets to the E. The greatest rate of the tidal current observed was 3 knots.