Port Cornwallis is a port situated on Ross Island, off the NE coast of North Andaman. This should not be confused with Ross Island, which is opposite Port Blair, South Andaman.
There is a lighthouse, commissioned in 1973, near Port Cornwallis, "on the summit of Bopung Hill at the entrance of Aerial Bay."
Coordinates: 13°17′N 93°05′E / 13.283°N 93.083°E