Dilesi is a seaside town on the border of Attica and Viotia and is 50 km from Athens.
Its name comes from Apollo the Dilian, who was worshiped in the area.In this place was the ancient Dilio, which was the port of the city of Tanagra. Ruins saved until these days. There was the sanctuary of Dilios Apollo, which were organized tourney of great religious and political importance for Viotous and especially for Tanagraeans.
A large Hellenistic portico was discovered in this area, which is considered to have defined the northern side of the sanctuary, while part of its foundation is also in the sea. In various places, archaeological finds have been found that testify to the dating of the area from ancient times.
Dilesi also became known from the battle at Dilio in 424 BC, where, during the Peloponnesian War, the Athenians clashed with the Viotous, in an attempt by Athens to control Viotia, but ended in its defeat. Many Thespians fell in the battle, while a polyandrium was erected at the base of which 9 columns were placed with the names of 202 people who lost their life in the battle.
Since December 2014, together with the settlement of Plaka Dilesi, they form the Municipal Unit of Dilios (Dilesiou). Until then it belonged to the Municipal Unit of Oinophyta, while Plaka belonged to the Municipal Unit of Schimatari.
Dilesi is a great holiday resort. It has organized beaches, restaurants, taverns, cafes and various other shops. Especially in the summer months, it has a lively nightlife.