Blue Hole (Red Sea)
The Blue Hole is a diving location on the southeast Sinai, a few kilometres north of Dahab, Egypt on the coast of the Red Sea.
Blue Gum Forest, Blue Mountains
The Blue Gum Forest is a protected nature reserve located in the Grose Valley of the Blue Mountains, in Blue Mountains National Park, in New South Wales west of Sydney, southeastern Australia. It is one of the best-known bushwalking sites in Australia. As part of the Greater Blue Mountains, the forest is within the UNESCO World Heritage Site. The forest survived through the efforts of early Australian conservationists.