Baja California Price: US$20million
Measuring 16 miles long, and located in the Sea of Cortez, to the east of the city of La Paz, is the rugged Cerralvo Island.
It covers 35,000 acres and is completely uninhabited, with arid desert vegetation and peaks reaching 2,100ft.
To the east, the sea drops down to 800 fathoms deep, providing the currents and sea habitat necessary for big-game fishing. It would be perfect for an exclusive eco-resort. Agent: Vladi Private Islands (0049 40 33 89 89; vladi-private-islands.de)