Arkose Nanterre-Arboretum on Clmb House. Venue in 1 place des Papeteries, 92000 Nanterre, France, France. Arkose Nanterre-Arboretum is an air-conditioned 2,000 m² bouldering gym west of Paris with 115 problems across 6 levels, around 40 fitness machines, a kids'...