It was dark and rainy when we arrived to canyon of Piva. Piva is a river in Bosnia and Herzegovina and Montenegro, shorter headwater of the Drina river, which it forms with the Tara river on the border with Bosnia and Herzegovina. The canyon is cut between the mountains of Bioč, Volujak, Maglić and Pivska planina, its 33 km long, deep up to 1.200 m and river generates immense power used for the power station of Mratinje (342 MW) which dammed the canyon in 1975. The dam is 220 m high, one of the highest in Europe.