Isla San Pedro de Martir
Distant in the mid-gulf channel, lies the very arid and hostile Isla San Pedro de Martir, a steep-cliffed rock pile of sandstone and volcanic cliffs rising 1,000-feet straight out of the Gulf. This one-square-mile island is so inhospitable, it has only 5 known species of vascular plants, but is alive with birds, lizards and sea lions. There is so much bird guano on San Pedro that it was a Mexican Penal Colony during the 1850s, where prisoners were sentenced to mine guano for gunpowder production.
Atop these scorching, steep cliffs, thousands of Tropic Birds, boobies, gulls and pelicans congregate and nest. There is a government-protected Blue Booby nesting sanctuary area on the north end of the island.
Cruise the Sonoran Desert by Boat
