Phasis (Ancient Greek: Φᾶσις; Georgian: ფაზისი, pazisi) was an ancient and early medieval city on the eastern Black Sea coast, founded in the 7th or 6th century BC as a colony of the Milesian Greeks at the mouth of the eponymous river in Colchis. Its location today could be the port city of Poti, Georgia. Its ancient bishopric became a Latin Catholic titular see of Metropolitan rank.