Kalaureia or Calauria or Kalavria is an island close to the coast of Troezen in the Peloponnesus of mainland Greece, part of the modern island-pair Poros.

Poros is a small Greek island-pair in the southern part of the Saronic Gulf, about 58 km south of the port of Piraeus and separated from the Peloponnese by a 200 m (656 ft) wide sea channel, with the town of Galatas on the mainland across the strait. Its surface area is about 31 square kilometres (12 sq mi) and it has 3,261 inhabitants (2021). The ancient name of Poros was Pogon. Like other ports in the Saronic, it is a popular weekend destination for Athenian travellers.