Ormenio (Greek: Ορμένιο, formerly Ὀρμένιον, Orménion,) is the northernmost place in all of Greece. It is located in the municipal unit of Trigono in the Evros Prefecture of Thrace, immediately south of the Bulgarian border. Ormenio is located west-northwest of Orestiada, about 200 km north of Alexandroupoli, about 40 km west of Edirne, Turkey and immediately south-southeast of Svilengrad, Bulgaria. Ormenio is linked with the GR-51/European route E85 (Alexandroupoli - Soufli - Orestiada - Ormenio), which connects across the border with the Bulgarian roads serving Svilengrad and Varna in addition to the A1 motorway which links Sofia and Edirne with the O-3 motorway (European route E80). The Evros river forms the border with Bulgaria to the east-northeast, with a land boundary lying to the north-northwest. During the Ottoman era, Ormenio was called Çirmen in Turkish.
In 1371 it was the site of the battle of Chernomen in which the Serb army under Ivan Uglesha and Valkashin was decisively defeated by the Ottomans. It was known as "Çirmen" during Ottoman rule and was a sanjak centre until 1829. In 1878 it was inhabited by 870 Bulgarians and 120 Ottomans. After the Balkan Wars], the village was annexed to Bulgaria as "Chernomen" until 1919, when the village was ceded to Greece in the Treaty of Neuilly. After World War II and the Greek Civil War, many of its buildings were rebuilt. In 1997 under the Kapodistrias reform, the community of Ormenio became the new municipality of Trigono with 16 other former communities.