Seuthopolis is the most famous underwater site in Bulgarian archaeology – the only thoroughly studied Thracian town on Bulgarian territory to date.
Seuthopolis was an ancient town founded by the Thracian king Seutus III, as well as the capital of the Odrysian Kingdom from 320 BC. It is currently under the waters of the Koprinka Dam. A unique archaeological and historical site, it is a treasure trove of information about the life and lifestyle of the Thracians.