落水洞是岩溶地区一种消泄地表水的近于垂直的洞穴，是流水沿裂隙进行溶蚀、侵蚀和崩塌作用而形成。洞口呈半圆形，直径约50m，深约40m。落水洞洞口朝向东南，可见崩塌堆积物，是丰水期的消水通道。

Sinkhole is a near-vertical cave that drains surface water in karst areas and is formed by corrosion, erosion and collapse along the fissures. The semi-circular entrance of the sinkhole faces south-east, is about 50m in diameter and about 40m deep. There are collapse deposits at the entrance. It is the water-removing passage in the wet season.