evidence: Serranilla Bank is a former atoll, now a mostly submerged carbonate platform consisting of shallow reef environments. It is about 40 km in length and 32 km in width, covering an area of over 1200 km2, almost entirely under water. Three small cays and two rocks emerge above the water to form the bank's islands. These are West Breaker, Middle Cay, East Cay, Beacon Cay and Northeast Breaker. They are largely barren, with sparse vegetation of bushes and some trees. Most of the reef is drying and many shipwrecks are located in its vicinity. [...] Read more about this topic: Serranilla Bank