Beacon Cay is the biggest island of trhe bank. It is about southwest of East Cay. It is a sandy island, with some coral rock formations. It is coverted with bushes. Grass grows in some places. Between 30 and 50 coconut palms grow of the island. There is a daymark made of corals at the western end. There are some buildings. There's also an active lighthouse which has been in use since 1977. It is made of steel. The lighthouse is probably operated by Colombian authorities.