The Bulgarian-Turkish-Greek border triangle is a challenged, peripheral borderland, including an EU external border. It comprises different components of heritage: Ottoman, Orthodox, European. Today, it is confronted with challenges of migration, peripherality, border militarization, uneven economic development, national assimilation policies and minority discrimination.
The southern Bulgarian triangle borderlands to Greece and Turkey have a turbulent history of wars, displacement, border closures, minority resettlement, but it is also home to archeologic sites from its common, Ottoman heritage. Meanwhile, the Evros river forming the Greek-Turkish border has played a tragic role in migration to the EU.