Blue Hole

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Lonely Planet review

The famous Blue Hole, part of the Lighthouse Reef, is one of Belize's natural wonders and the most unique dive site in the region. A popular day trip from San Pedro, the Blue Hole is renowned for its unusual appearance - a deep blue pupil with an aquamarine border surrounded by lighter shades of the reef.

The Blue Hole is around 120m (400ft) deep and 300m (1000ft) across - to dive it is to take a journey into geological history. For millions of years, it was a dry cave where huge stalactites and stalagmites slowly formed. When the last ice age ended, sea levels rose about 100m (350ft), flooding the cave. At the same time, its ceiling collapsed, leaving the hole you see today.

The trip to the Blue Hole is usually combined with other dives at Lighthouse Reef.