Rob Roy Bank, a ridge about 15 miles long in a NW to SE direction with a least depth of 2.1m, lies about 27 miles SE of Tanjung Medang. A patch with a depth of 2.4m lies about 1.5 E of the 2.1m depth. The bank is steep-to on its NE and SW sides.
A lighted beacon, exhibiting a racon, stands in the middle of the bank.
A wreck, the exact depth which is unknown but which is considered to have a safe clearance of 15m and whose charted position is only approximate, lies about 11 miles E of Rob Roy Bank. Another wreck, with a depth of 17m, was reported to lie 1.5 miles farther SE. Another dangerous wreck lies in an approximate position about 10 miles NE of the bank.