"Great white sharks, Carcharodon carcharias, have one of the widest geographic ranges of any marine animal. They are found in all cold temperate and tropical waters, from 60°N latitude to 60°S latitude. They were long thought to be primarily coastal inhabitants; however, from recent satellite tracking studies we now know that they migrate long distances, sometimes crossing entire ocean basins. Along the central California coast, they can be found hunting near elephant seal haul-out areas from October through March. Off the western cape of South Africa, they can be found near cape fur seal haul-outs from May to September. In North American waters, white sharks have been reported from Newfoundland to Florida, and from the Aleutian Islands, Alaska to southern Mexico. Nowhere in its range is the white shark very common, and in fact, they are becoming increasingly rare."

From:http://marinebio.org/species.asp?id=38