Maritsa
Maritsa or Maritza ( ), also known as Meriç ( ) and Evros ( ), is a river that runs through the Balkans in Southeast Europe. With a length of , it is the longest river that runs solely in the interior of the Balkan peninsula, and one of the largest in Europe by discharge. It flows through Bulgaria in its upper and middle reaches, while its lower course forms much of the border between Greece and Turkey. Its drainage area is about , of which 66.2% is in Bulgaria, 27.5% in Turkey and 6.3% in Greece. It is the main river of the historical region of  Thrace, most of which lies in its drainage basin. It has its origin in the Rila Mountains in Western Bulgaria, flowing east-southeast between the Balkan and Rhodope Mountains, past Plovdiv and Dimitrovgrad to Edirne in Turkey. East of Svilengrad, Bulgaria, the river flows eastwards, forming the border between Bulgaria (on the north bank) and Greece (on the south bank), and then between Turkey and Greece. At Edirne, the river meets it two chief tributaries Tundzha and Arda, and flows through Turkish territory on both banks. It then turns towards the south and forms the border between Greece on the  west bank and Turkey on the east bank all the way to the Aegean Sea, which it enters near Enez forming a river delta. The upper Maritsa valley is a principal east–west route in Bulgaria. The unnavigable river is used for power production and irrigation. Etymology. The earliest known name of the river is (, Alcman, 7th–6th century BC). Indo-European and meant "wide". The Indo-European "wr" sound shifted in Thracian to "br", creating the Thracian name . Thereafter, the river began to be known as () in Greek and in Latin. Rather than an origin as "wide river", an alternative  hypothesis is that is borrowed from Thracian meaning "splasher". While the name () was used in Ancient Greek, the name () had become standard before the ancient form (now: ) was artificially restituted in Modern Greek. The name may derive from a mountain near the mouth of the river known in antiquity as or , Latinized as . History. In 1371, the river was the site of the Battle of Maritsa, also known as the battle of Chernomen, an Ottoman victory over the Serbs. Vukašin Mrnjavčević and Jovan Uglješa died in the battle. Migration. The Maritsa/Evros 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 Evros river. Up until that time, drowning in the Evros was the leading cause of death among migrants trying to enter Greece. Following the heavy losses Turkish armed forces incurred at the hands of the Russian-backed Syrian government in northern Syria at the end of February 2020, a drastic change in Turkey's policy towards irregular migrants on its territory led to escalation  of the situation at the Evros border crossings as well as exacerbation of tension between Turkey on one hand and Greece and the EU as a whole on the other hand. In May 2020, news emerged that Turkish forces occupied a of Greek territory, Melissokomeio, as shown on maps of 1923, following a change in the flow of the Maritsa/Evros river. Tributaries. Starting from the river's source, significant tributaries of Maritsa include: Floods. The lower course of the river Maritsa/Evros, where it forms the border of Greece and Turkey, is very vulnerable to flooding. For about 4  months every year, the low lands around the river are flooded. This causes significant economic damage (loss of agricultural production and damage to infrastructure), which is estimated at several hundreds million Euro. Recent large floods took place in 2006, 2007, 2014, with the largest flood taking place in 2021. Several causes have been proposed: more rainfall due to climate change, deforestation in the Bulgarian part of the catchment area, increased land use in the flood plains and difficult communication between the three countries. Honours. Maritsa Peak on Livingston Island in the South Shetland Islands, Antarctica is named after Maritsa River . "La Maritza" is also a 1968 song written by and Pierre Delanoë and interpreted by Sylvie Vartan. Hebrus Valles on Mars is named after this river. The Bulgarian Maritsa motorway, which roughly follows the course of the river from Chirpan (where it branches out of the Trakia motorway) to the Turkish border at Kapitan Andreevo, is also named in honour of the river.