The channel is almost 1 mile wide with depths of 6 to 14m in the fairway. The channel is contracted to a width of 0.3 mile at its SE entrance by the extending shoal which has a least depth of 4.8m.
In Selat Padang the E current has a maximum rate of 2 knots and makes about 2 hours after LW. The W current has a maximum rate of about 3 knots and makes about 2 hours after HW.
Toward neaps the currents are very weak but the W current predominates.