The port has a natural harbour, consisting of a series of inlets and islands at the mouth of the Klang River.

It has a maximum depth of 18 metres (59 ft), and can accommodate panamax and capsize vessels.

The port has two navigational channels — Pulau Angsa (North) and Pintu Gedong (South), with a combined length of 13.3 nautical miles (24.6 km).

However, anchoring of vessels within 1 nautical mile (1.9 km) radius of the South Fairway Buoy is prohibited.

On the other hand, The Outer Anchorage North Channel is the recommended anchorage for vessels waiting for pilots about 0.5 nautical miles (0.93 km) before the pilot boarding ground, where the water depths is 15–22 metres (49–72 ft).

[1] The approach channel to South Port starts at the southern end of this fairway, and is 2.6 nautical miles long and has a minimum width of 210 meters.

Vessels with a maximum draft of 15 meters are able to navigate through the Pulau Angasa Channel with tidal support.