Piirissaar is an island located in Tartu rural municipality, Tartu County, on the border between Lake Peipus and Lake Lämmijärv, 15 km southeast of the mouth of the Emajõgi River. The size of the island has continuously decreased overtime, from 20 km², in the eighteenth century to 7.5 km², today.

Piiri village
Shop, location of the Estonian-language church and school, Piirissaar Lutheran cemetery, Old Believers’ cemetery of Piiri village.
Tooni village
Harbour, Village Centre, Church of St. Peter-Paul, Old Believers’ cemetery of Saare village.

Saare küla
Piirissaar Old Believers' Museum, “Titanic.”