Stemnitsa (Greek: Στεμνίτσα) is a mountain village in the municipal unit of Trikolonoi, Arcadia, Peloponnese, Greece. It was the seat of the former municipality Trikolonoi. Stemnitsa is a traditional settlement and is considered one of the most beautiful villages in Arcadia, due to its picturesque location and its historical churches and mansions.^[2] It is situated at the western edge of the Mainalo mountains, above the left bank of the river Lousios, at about 1050 m elevation. Stemnitsa is 6 km southeast of Dimitsana, 9 km northeast of Karytaina, 18 km northwest of Megalopoli and 26 km west of Tripoli. In 2011 Stemnitsa had a population of 191.