Gouffre de Belvaux, Natural sinkhole in Han-sur-Lesse, Belgium
The Gouffre de Belvaux forms where the Lesse River enters underground, creating a 45-meter deep geological formation in the limestone massif.
The first successful exploration to reach the bottom of the sinkhole occurred in 1964 when Bob Destreille completed a pioneering diving expedition.
The sinkhole integrates with the Han Caves system, which contains archaeological evidence of human presence dating back to the 5th century BC.
The sinkhole maintains a constant water temperature of 13 degrees Celsius and connects to over 14 kilometers of underground river passages.
During winter floods, the Lesse River overflows the sinkhole's absorption capacity, temporarily returning to its ancient surface course around the Boine massif.
Location: Rochefort
Elevation above the sea: 244 m
GPS coordinates: 50.11470,5.20331
Latest update: May 27, 2025 17:43
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