The Desertas Islands (Portuguese: Ilhas Desertas, pron. ; literally Desert Islands), are a small Portuguese archipelago, located about 25 km to the southeast of Ponta de São Lourenço, the eastern tip of the island of Madeira, the whole chain located roughly between Madeira and the Canary Islands. It is a chain of three long and narrow islands that stretch over a distance of 23 km north-south. Administratively, the islands are part of the municipality of Santa Cruz, Madeira, and therein of the civil parish of the same name.
Though its closeness to the main island of Madeira, the geology of the Ilhas Desertas is starkly different. The high, long, and rocky islands of the group are barren of soil, and the only wildlife consists of about sixteen species of birds, including eight species of seabirds, and a scarce population of feralgoats, rabbits, and rodents, brought from Portugal by the mariners who first touched the rocky shores. Native species of tarantula, as well as reptiles, also exist in the fragile and aridecosystem.
The only inhabitable island, with its own water source, is Deserta Grande. This water is however murky and scarce, and all historical attempts to colonise the island failed due to the impracticability of communal agriculture.
A tiny colony of monk seals inhabit the beaches, and since 1990 the islands have been a nature reserve for their protection. Although in 1998 the colony numbered only eight, by today, the population numbers roughly twenty. The only human presence are the permanent wardens, geologists, occasional boaters, and the few research stations on the islands.
The islands of the Desertas are, listed from north to south, with approximate area figures: