Spectacular journey along an underground river.
No crawling through muddy caves here – the river has cut a vast underground chasm through the limestone. Various parts of the route have dramatic names to match the dimensions of the place: The Gothic Cathedral, 37 metres high and 10 metres wide at its base and The Grand Diaclase, 60 metres high and over 130 metres long.
Text GS. Image copyright Abîme de Bramabiau.
