You might have noticed the small hillocks scattered throughout the countryside, emerging from the otherwise flat landscape. These hills – that are characteristic of the area – are called ‘Tiennes’ in the local dialect. This landscape is typical of the Calestienne. The Tiennes are the result of millions of years of work; by the sea, the folding of the earth’s crust, periods of extreme cold and global warming. The infiltration of water has given birth to a maze of caves such as the caves of Han, Rochefort, or even Remouchamps.