The Sungai Batu Pahat, SE of Muar, is fronted by a shallow flat which, extends up to 3 miles offshore. A depth of 0.3m exists on this flat near the river entrance at LW.
Within the entrance there are depths of 2.5 to 5m as far as the town of Batu Pahat (Bandar Penggaram), about 4 miles upstream.
The river is navigable by light-draft vessels for many miles but should only be entered by vessels that have local knowledge.
Pilotage is not compulsory. A local qualified pilot is not available, but an experienced guide can be obtained from the District Marine Office, Batu Pahat.