Sostis (Greek: Σώστης, romanized: Sóstis; Turkish: Susurköy) is a village and a former municipality in the Rhodope regional unit, East Macedonia and Thrace, Greece.

Since the 2011 local government reform it is part of the municipality Iasmos, of which it is a municipal unit.

[2] The municipal unit has an area of 229.190 km2.

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