The village of Skala Oropou, within the bounds of the municipality, was the site an important ancient Greek city, Oropus, and the famous nearby sanctuary of Amphiaraos is still visible today.

[2] The municipality Oropos stretches between the Parnitha mountains and the South Euboean Gulf, opposite Eretria (on the island Euboea).

The town Oropos, the seat of the municipality, is situated on the lower course of the river Asopos, 4 km south of the coast.

The site has been excavated by the Greek Archaeological Society;[7] it contained a temple, a sacred spring, into which coins were thrown by worshippers, altars and porticoes, and a small theatre, of which the proskenion is well preserved.

[8] During the Regime of the Colonels composer Mikis Theodorakis was interned in the concentration camp at Oropos[9] before going into exile in Paris.