God's Bathtub

Blue Lake National Park is a national park in Queensland, Australia, 44 km east of Brisbane on North Stradbroke Island. The park's main features is Blue Lake which is known as a window lake and is just under 10 metres deep when full. It is home to the southern sun fish. Water from the lake overflows into the Eighteen Mile Swamp. The aboriginal name for Blue Lake is Karboora.

Scientists in Australia have discovered that Blue Lake has been unaffected by pollution and other man-made changes for over 7,500 years and has thusly been nicknamed God's Bathtub.