Forat Negre

Going along the Castellterçol to Granera road (BV-1245), after kilometre 7 there are two consecutive bends to the right (Revolt del Forat Negre); from the first of them, on the other side of the stream the mouth of the cavity should be visible, but the thick vegetation does not allow it. The best route is to follow the road until just before kilometre 8 and, on coming out of the bend to the right, from where the houses of Granera can already be seen, on the left of the road a track begins that in a couple of twists descends to the stream. Here you must continue to the left, following the course of the stream downstream along its left bank; further on there is a wide turn-off to the right, which crosses the stream by a cemented ford and continues towards the houses of Salvatges. A little further on another track also comes off which must likewise be left and you continue skirting the stream for a further hundred metres or so where a wide path descends to the riverbed. At this point there is a small retaining wall of the nearby can Marcet reservoir which makes crossing the stream easier. You must go up the right bank about 25 metres of gradient and, among holm oak woodland and brambles, it leads us in a straight line to the base of the nearby crag where the Forat Negre is found.

This route can also be done in the opposite direction from the old Marcet factory, but depending on the time of year we may find that the ford that crosses the reservoir is flooded.