Sombrero Channel separates the central and S groups of the Nicobar Islands. The channel is 30 miles wide between Cape Albany and Sombrero Point, the N extremity of Little Nicobar Island.
The depths in the channel are irregular, but there is deep water in mid-channel.Strong tidal currents set through this channel.
A yellow clay patch, with a depth of 21.9m, lies in the W approach to Sombrero Channel about 12 miles WSW of Cape Albany.
Shoal patches may exist in this area.
A detached coral bank, with a least depth of 17.1m, extends up to 12 miles SSW of Cape Albany. Depths elsewhere on this bank range from 20.1 to 31.1m. This bank has been reported to be extending to the W.
Trak and Treis islands Nicobar
Trak Island lies 5 miles WNW of Sombrero Point; Treis Island lies 1 mile SE of Trak Island.
Both islands are small, reef-fringed, and surrounded by sunken rocks.
A rock, which has a depth of less than 1.8m, lies about midway between Treis Island and Sombrero Point.
30 Nov 11