Póros, an island municipality in the Saronic Gulf, is geographically composed of two islands: Sphairia, a volcanic islet where the main town is located, and Kalavria, the larger, pine-covered part.

In ancient times, Póros, then known as Kalaureia, was a sanctuary dedicated to Poseidon, making it a significant religious center and the seat of the Kalaureian League, an ancient alliance of maritime cities.

The strategic location of Póros made it a crucial naval base during the Greek War of Independence in the early 19th century, playing a vital role in supplying and supporting the Greek fleet.

The Treaty of Póros, signed in 1828, marked a pivotal moment in the recognition of Greek independence by international powers, solidifying the island's role in Greek national history.

Póros's Demogerontia, established during the Greek Revolution, served as one of the first provisional governments of liberated Greece, showcasing its early political significance.

The population of Póros has experienced fluctuations over the centuries, with a current permanent population of around 4,000 residents, swelling considerably during the tourist season.

Tourism is the primary industry on Póros, attracting visitors with its scenic beauty, historical sites, and proximity to Athens, generating significant revenue for the local economy.

Fishing and agriculture, particularly olive cultivation and citrus fruit production, remain important secondary industries on Póros, reflecting its traditional agricultural roots.

The Monastery of Zoodochos Pigi, built in 1720, is a prominent landmark on Póros, known for its exquisite architecture, stunning views, and historical significance as a refuge during times of turmoil.

The Archaeological Museum of Póros houses a collection of artifacts excavated from the ancient sanctuary of Poseidon and surrounding areas, showcasing the island's rich archaeological heritage.

The picturesque Póros Town, with its neoclassical architecture, narrow streets, and vibrant waterfront, offers a charming blend of traditional Greek island life and modern amenities.

A traditional festival celebrated on Póros is the "Klidonas" on June 24th, featuring bonfires, fortune-telling, and local dances, reflecting the island's cultural traditions.

While Póros is not currently a designated UNESCO World Heritage site, the island's historical and archaeological importance makes it a potential candidate for future consideration.

The Galatas lemon forest, easily accessible from Póros, is a unique natural landscape showcasing thousands of lemon trees and offering breathtaking views of the island and surrounding waters.

Póros’s verdant landscape, particularly on Kalavria, is dominated by pine forests, contributing to the island's natural beauty and making it a popular destination for hiking and nature lovers.