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Great Blue Hole
No. 1 of Best Things to Do in Belize

Great Blue Hole

6.7
4.8/5
11 reviews

Great Blue Hole is a giant marine sinkhole near Lighthouse Reef in Belize. It is nearly circular in appearance, with a diameter of approx. 300 m and a depth of over 100 m, making it a world-renowned scuba diving destination in the Caribbean. French ocean explorer Jacques Cousteau led an expedition ship here to explore it and named it one of the world's top 10 diving sites, making it widely known. Its origin is quite unique: during the glacial period, it was a limestone cave. After the glacial period ended, sea levels rose, the cave was submerged, and the roof collapsed, leaving behind this circular opening that looks like a deep blue pupil when viewed from the air. Tens of meters underwater inside the cave, it still retains massive stalactites from its time as a dry cave, slanted in the dark waters, which are iconic sights that scuba divers travel specifically to see. The water inside is deep, almost indigo, creating a sharp contrast with the surrounding turquoise shallow reefs. It is particularly stunning when viewed from above. It is worth noting that there are almost no fish or coral inside the cave, as the main attractions are the geological wonders. Nurse sharks and Caribbean reef sharks often patrol the edge of the opening, and sometimes bull sharks can be encountered. If you are not scuba diving, snorkeling in the shallow reef area near the opening also allows you to see coral and fish through the clear water. Half Moon Caye on the same atoll is home to flocks of red-footed boobies and is a great place to visit while you are there.

Belize

Experiences you can't miss in Placencia

Featured Outdoor & sports in Placencia

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Snorkel the Perfect Tropical Isle Silk Caye with Turtles, Rays and Sharks
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4.8/5
· 45 reviews
Duration: 8 hrs
English
Free cancellation
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95.6% of travelers recommend
FromUS$180.00
Private Cave Tubing & Xunantunich (Mayan Ruins) From Placencia
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5.0/5
· 60 reviews
Duration: 10 hrs
Free cancellation
60 consecutive positive reviews
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Private (Group) Cave Tubing + Xunantunich from Placencia
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4.7/5
· 15 reviews
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Free cancellation
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Cave Kayak tour DiY
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5.0/5
· 9 reviews
Duration: 3 hrs
English
Free cancellation
FromUS$49.00
Belize Cave Tubing & Zip Line Adventure from San Ignacio
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4.9/5
· 13 reviews
Duration: 7 hrs
English
Free cancellation
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FromUS$150.00
Cave Kayaking with Private and Zipline Options
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4.9/5
· 30 reviews
Duration: 5–8 hrs
Free cancellation
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FromUS$75.00
Belize City: Cave Tubing or Crystal Cave and Tubing or Zipline and Tubing
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4.5/5
· 2 reviews
Duration: 5–7 hrs
Free cancellation
FromUS$79.44
Ultimate Belize Adventure Cave Tubing & Zip Line from San Ignacio
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5.0/5
· 40 reviews
Duration: 8 hrs
Free cancellation
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40 consecutive positive reviews
FromUS$165.00
Placencia Today's weatherIntermittent clouds 23-30℃
Placencia weather for the next 2 days11/10: 24-29℃, 11/11: 24-30℃

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What travellers say about Placencia

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YoYo_1I8Q7O5O1 August 2025
5.0
大蓝洞(The Great Blue Hole)‌是位于中美洲伯利兹海岸灯塔礁(Lighthouse Reef)中心的一处世界著名海洋蓝洞,因其独特的自然景观和地质特征而闻名于世,被誉为“地球的瞳孔”和世界十大地质奇迹之一。

Great Blue Hole

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