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 Grotto (Malta)
The Blue Grotto () refers to a number of sea caverns on the south east coast of Malta, a short distance off the fishermen's harbour of Wied iż-Żurrieq limits of Qrendi, Malta