Arco - Trento Area Rock climbing1,915 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 to here.
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