In 1371, the river was the site of the
Battle of Maritsa, also known as the battle of Chernomen, an
Ottoman victory over the
Serbian rulers
Vukašin Mrnjavčević and
Jovan Uglješa, who died in the battle. After 1923, the river gained political significance as the modern border between
Greece and
Turkey. This was further bolstered by Greece joining the
European Union in 1981 (and then the
Schengen area), marking the river as an external boundary of the EU. Since the 1990s, the river, as a natural barrier on the border between Turkey and Greece, has become a major route for
migrants from a variety of countries attempting to enter the
EU irregularly. Between 2000 and 2019, 398 bodies were found on the Greek side of the Maritsa/Evros river. Up until that time, drowning in the river was the leading cause of death among migrants trying to enter Greece. In February 2020, Turkey unilaterally opened its borders to Greece to allow refugees and migrants seeking refuge to reach the European Union, leading to the
2020 Greek–Turkish border crisis. In May 2020, news emerged that Turkish forces occupied of Greek territory, Melissokomeio, as shown on maps of 1923, following a change in the flow of the river. These crises passed following the improvement in Greek-Turkish relations in 2023, however, illegal migration is still a major issue. ==Tributaries==