Along with Dog, Scrub, Little Scrub, Seal, and Sombrero islets, the Prickly Pear Cays are located on the drowned Anguilla Bank. The cays are characterized by Early Miocene reefal limestone positioned upon Eocene-Oligocenevolcanic rocks. These form a section of the active volcanic arc of the Lesser Antilles. The two cays are located close to each other at. They are accessible from Road Bay, Anguilla and Saint Martin either by catamaran or sail boat. West Cay is longer than East Cay. North Cay, a rock outcrop, is situated north of East Cay. There is also a rock outcrop between Prickly Pear Cays and another cay known as Bush Cay, which is separated by a waterway. Another rocky protrusion, known as Flirt Rocks, is situated north of Prickly Pear Cays. Dog Island Channel separates Dog Island from the Prickly Pear Cays. West Cay is narrow, about long and rugged. Its western bay is covered with brush which rises to a height of. With rocky coral reefs, it has no easy boat landing facility. East Cay is about long and wide. It has sparse vegetation and a sandy shoreline. The east cay also has salt ponds. Prickly Pear Cays have been designated as a marine park with permanent moorings. There is total ban on coral extraction or shells from underwater and spear fishing is not allowed. The sea is generally calm. Prickly Pear Reef is an underwater canyon with ledges and caves whose depth varies from to and includes an underwater, chimney-like formation.
Geology
The geological formation in both the cays is of laminated calcareous sandstone. The layered stratigraphic formation is inferred to be due to "successive deposits by the tides or overflows from a troubled sea." Over a long period of exposure, these formations have developed a laminated condition with the lamination beds of to thickness. The strata are disturbed in several sections. They have been assessed as suitable for use in pavements in view of their compact formation. At West Cay, an old quarry near a good harbour was used for exporting sandstone slabs.
Flora and fauna
Along with certain sections of mainland Anguilla, Prickly Pear Cays were classified as 'wildlands' by ECNAMP in 1980. Many types of plants, birds and reptiles have been recorded in both the cays. Uncontrolled grazing by livestock is permitted in all the vegetation areas.
The islands are popular with tourists due to the abundant marine and bird life. There are two restaurants and a bar which are serviced by staff who come in each day from the mainland of Anguilla. Thatch roofed structures provide the ambiance for the vistas of the turquoise blue seas which attract visitors to the cays. The East Cay has a landing area which requires careful maneoeuvring. Snorkelling and diving are possible in the East Cay amidst the coral reefs, with several sunken ships in the area.