Selat Asam, which lies between Pulau Padang to the W and Pulau Merbau and Pulau Tebing Tinggi to the E, has a least width of about 1 mile and a least depth of about 12m in its N approach.
The shores are steep-to, except off the N entrance point at its S end where it joins Selat Lalang and Selat Pandjang. A spit, with a depth of 8m at its outer end, extends about 1 mile S from this point.
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