Meda Gran, the largest one, has an area of 1.8 km² and is the only island of a considerable size. It has some mediterranean vegetation and a nineteen-century lighthouse on it. The second largest island, Meda Xica is only 0.24 km².
Ecology
These islands were declared a protected area by the Catalan Autonomous Government in 1983, becoming an important marine reserve in the Western Mediterranean.
Despite the ravages caused by industrial pollution and mass-tourism in the Mediterranean coast of the Iberian Peninsula, there is still a significant amount of marine biodiversty in the waters off the islands, like large submarine meadows of Posidonia oceanica and underwater caves where groupers breed.