The Călimani Mountains (Romanian: Munții Călimani, Hungarian: Kelemen-havasok) are the largest volcanic complex of the Carpathian Mountains in Transylvania, Romania. Geologically they belong to the Căliman-Harghita Mountains group of the Inner Eastern Carpathians. Among the major tourist attractions include odd shapes of volcanic rocks on Tihul, Rusca and Rețițiș Mountains, but especially on Tămău and Lucaciu Mountains. In the last sector can be found the geological reserve 12 Apostles.