Syrna
Syrna is a mountain village and a community in the municipal unit of Trikolonoi, western Arcadia, Greece. Syrna is situated on a mountain slope above the right bank of the river Alfeios, at about 800 m elevation. In 2011 Syrna had a population of 60 for the village and 62 for the community, which includes the village Ano Kalyvia. Syrna is 2 km northwest of Palamari, 4 km southeast of Elliniko, 6 km northeast of Karytaina and 6 km southeast of Stemnitsa.
It is postulated to have been the site of the ancient Greek city of Thyreum.
Population
| Year | Village population | Community population |
| 1981 | - | 224 |
| 1991 | 159 | - |
| 2001 | 188 | 210 |
| 2011 | 60 | 62 |
| 2021 | 42 | 49 |