The Caves of Hotton are speleothem caves located in Wallonia near Hotton in Belgium, which were discovered in 1958 and are around 5 or 6 km long and 70 metres deep.[1][2] A stream called Syphon runs at the bottom of the caves.
[ ⚑ ] 50°15′33″N 5°27′21″E / 50.2592°N 5.4559°E
Original source: https://en.wikipedia.org/wiki/Caves of Hotton.
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