Poros is an island in the Saronic Gulf and has about 4,350 permanent residents. It is just 31 nautical miles from Piraeus and is the ideal choice for day trips. It has the privilege to be a unique island with 24 hour access via the coast of the Peloponnese. It owes its name to the narrow sea channel (poros in ancient Greek) that separates the island of Poros from the Peloponnese.