The Rubicon is an underground river in the province of Liège in the northern-central part of Belgium. It flows through the Caves of Remouchamps, where the world's longest underground trip by boat in a cave is possible 600 metres (2,000 ft).

Rubicon (Belgium)
Rubicon River in the Caves of Remouchamps
Location
CountryBelgium
Physical characteristics
Source 
 • locationLiège Province

50°29′02″N 5°43′03″E / 50.48389°N 5.71750°E / 50.48389; 5.71750