Moreton Island & North Stradbroke Island form a natural barrier around Brisbane, sheltering the city from the wider ocean.   This area includes more than 70 beaches, traditional fishing villages, inland lakes, freshwater springs and rare wildlife.   The waters of Moreton Bay are a marine park which include 40 nautical wrecks, hard coral quays, ravines and drop outs and some of the best diving opportunities in Australia.  It is also home to dolphins, turtles, the endangered sea mammal the dugong, and some 1,200 species of fish.  From June to November there is whale watching and one of the fun activities is to watch or feed the wild dolphins that come into Tangalooma each evening.  Moreton Island is one of the largest sand islands in the world.