Dikaia is a village in the northern part of the Evros regional unit in Greece. Dikaia was the seat of the former municipality of Trigono, and is part of the municipality Orestiada since 2011. In 2021, its population was 557 for the community, which includes the villages Dilofos, Krios and Palli. It is located on the right bank of the river Evros, where it forms the border with Bulgaria. It is about 15 km southeast of Svilengrad, Bulgaria, and 25 km west of Edirne, Turkey.