Blue Hole

Attraction·DahabMentioned by Lonely Planet
Blue Hole
Photo: Wikimedia Commons
“A blue hole is a large marine cavern or sinkhole, which is open to the surface and has developed in a bank or island composed of a carbonate bedrock. Blue holes typically contain tidally influenced water of fresh, marine, or mixed chemistry. They extend below sea level for most of their depth and…”
— Wikipedia
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accessible from shore for snorkeling

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