World’s second deepest canyon located in Turkey’s Black Sea province of Kastamonu attracts visitors. Kastamonu's Pinarbasi district is home to two canyons which have a huge tourism potential with their natural beauties, attractions and proper for nature sports such as rock climbing and trekking. “Valla Canyon is the world’s second deepest canyon. The most deepest one locates in Arizona in the U.S.,” Senol Yasar, mayor of Pinarbasi district, said. Yasar ...