The lively city of Bitlis stands in the middle of a green oasis. The city's architecture uses the local dark stone, with stone monuments including the Şerefhan Madrasah, the 12th-century Ulu Mosque, the Seljuk Gökmeydanı Mosque and the Ottoman Şerefiye Mosque. Nemrut Ski Centre in Tatvan county is a popular winter resort with one of the longest ski runs in Turkey. Nemrut Ski Centre At one side of the resort is the world's second largest Crater Lake and the beautiful Lake Van on the other. Lake Van From Tatvan on the western shore of Lake Van (25km northeast of Bitlis) you can take a passenger and train ferry to Van across the waters.