Col De Haussire (498 m.): "first climb in Belgium" can be read on a sign at the top of the famous climb of La Roche-en-Ardenne. A reference to the Belgian standard work 'Cotacol', which officially declared the Haussire to be the most difficult ascent in our country. The numbers speak for themselves: 3.8 km at 6.9% with peaks of up to 14%. So we went to see for ourselves and immediately joined the experts.