Arco - Trento Area Rock climbing1,800 routes in region
The Sarca valley and its surroundings offers a lifetime worth of vie ferrata, sport and multi-pitch climbing on limestone. The area is especially popular around Easter or other holidays when many German climbers flock in.
An overview of crags close to lake Garda, few topos: http://www.gardaclimbing.it
Topos for sport crags around Arco: http://www.arcowall.com/falesie/aree.asp
collection of topos of multi-pitch climbs in the Sarca-valley (in Italian): http://www.arrampicata-ledro.it/Valle%20del%20sarca/Valle%20del%20Sarca%202.htm