Tertenia is a town and comune (municipality) in the Province of Ogliastra in the autonomous island region of Sardinia in Italy, located about northeast of Cagliari and about south of Tortolì. It has 3,834 inhabitants.
Tertenia borders the municipalities of Cardedu, Gairo, Jerzu, Lanusei, Loceri, Osini, and Ulassai.
It is located in a high valley at the base of Mt. Arbu and Mt. Ferru, along the Rio Quirra river.
Demographics As of 2026, the population is 3,834, of which 49.8% are male, and 50.2% are female. Minors make up 14.3% of the population, and seniors make up 27.6%.
Immigration As of 2025, immigrants make up 3.8% of the total population. The 5 largest foreign countries of birth are France, Germany, Argentina, Romania, and the United Kingdom.
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