What is "matochina"

Matochina (, " lemon balm") is a small village in southeastern Bulgaria, part of Svilengrad municipality, Haskovo Province. Matochina lies in the southernmost ridges of the Sakar Mountain, from the municipal centre Svilengrad and from the provincial capital Haskovo; it is located just west of the Bulgaria– Turkey border and not far northeast of the Bulgaria– Greece border. The village is famous for the medieval Matochina Fortress.