The Valle Verzasca is a valley in the Locarno district of the Canton of Ticino, Switzerland. It comprises the municipalities of Mergoscia, Vogorno, Corippo, Lavertezzo, Brione, Gerra, Frasco, and Sonogno. As of 2004, the total population of 3,200. Mergoscia is at the geographical center of the Ticino, and none of the passes out of the valley cross cantonal or national borders.