蓝色无限(Blue Unlimited)

伯利兹灯塔礁中心附近的大蓝洞是世界上最令人印象深刻的自然奇观之一。这个318米宽、124米深的海沟是在上一次冰川作用期间形成的，当时一个洞穴系统崩溃，海平面上升淹没了该地区。
原文：
The Great Blue Hole, near the center of Lighthouse Reef in Belize, is one of the most impressive natural wonders in the world. This sea sink, 318 meters wide and 124 meters deep, formed during the last glaciation when a cave system collapsed and rising sea level flooded the area.
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