Thrace is the north-eastern part of Greece, next to Bulgaria and Turkey. The Evros river forms the border with Turkey, and its wetlands are home to wildlife. The Nestos river is used for rafting and kayaking, and the Rhodope mountains have hiking routes. Alexandroupoli, Komotini and Xanthi are the main towns. Komotini and Xanthi have mosques, and Xanthi has an old town.