Delium was a small town in ancient Boeotia with a celebrated temple of Apollo. It was located upon the sea-coast in the territory of Tanagra in Boeotia, and at the distance of about a mile (1.6 km) from the territory of Oropus. This temple, which like the town took its name from the island of Delos, is described by Livy as overhanging the sea, and distant 5 miles (8.0 km) from Tanagra, at the spot where the passage to the nearest parts of Euboea is less than 4 miles (6.4 km). Strabo speaks of Delium as a temple of Apollo and a small town (πολίχνιον) of the Tanagraei, distant 40 stadia from Aulis.