Valle Verzasca  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. The valley is formed by the Verzasca River and is situated between the Leventina and the Maggia and culminates at Pizzo Barone. Located between the Leventina and the Valle Maggia valleys, Valle Verzasca extends over a length of in north–south direction, and is situated in the north of the Lago Maggiore. The valley floor is at about to above sea level. The surrounding mountains respectively passes have an average altitude of . The Valley is crossed by the "Verzasca" river, it is dammed at the southernly outlet of the Valley, forming the Lago di Vogorno, before it flows in the Magadino plain in the vicinity of the Ticino River in the Lago Maggiore. Due to the different altitudes, all climate zones are combined in the Valle Verzasca. Tenero-contra and Gordola include the insubric climate region thanks to the deep sea level, close to the Lago Maggiore and protected by the mountains from the north winds. Vineyards and Mediterranean vegetation benefit of the mildest climate of Switzerland, nebulae are rare and rainfall of short duration. With increasing altitude the hills and mountain climate goes over to regions dominated by the Alpine climate (over ). The diversity benefits among other things, the cultivation of vines, and it flourish chestnut forests and palm trees thrive. Due to differences in soil type and the amount, almost all flora occurring in the Ticino and fauna of the various environmental zones are found in the Verzasca Valley. By the Romans introduced and comparable to the tropical wood species, "Castanea sativa" is in the southern part of the valley, below , the dominant species. It is no longer actively cultivated, but favors the further diffusion, and studies suggest to take advantage of the valuable wood of chestnut as a valuable wood. In the Valle Verzasca the endemic "Nera Verzasca" goat has been preserved, which looks very much like the ancient Roman goat.