Evros is one of the regional units of Greece. It is part of the region of East Macedonia and Thrace. Its name is derived from the river Evros, which appears to have been a Thracian hydronym. Evros is the northernmost regional unit. It borders Turkey to the east, across the river Evros, and it borders Bulgaria to the north and the northwest. Its capital is Alexandroupoli. Together with the regional units Rhodope and Xanthi, it forms the geographical region of Western Thrace.