Rezovo (Bulgarian: Резово, pronounced [ˈrɛzuvu]) is a village and seaside resort in southeastern Bulgaria, part of Tsarevo Municipality, Burgas Province, in the coastal Strandzha geographical region. The village is situated in Strandzha Nature Park. Lying at the mouth of the Rezovo River in the Black Sea, Rezovo is the southernmost point of the Bulgarian Black Sea Coast and the southeastern-most inhabited place in Bulgaria and the European Union mainland. The village is located 11 kilometres south of Sinemorets, 17 km from Ahtopol and 36 km from Lozenets. As the Rezovo River constitutes the border between Bulgaria and the European part of Turkey, Rezovo directly overlooks the Turkish bank of the river and the Turkish village of Beğendik, in Demirköy district, Kırklareli Province.
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Researchers have attempted to link the village's name to that of Rhesus of Thrace, a Thracian king of the Iliad, and although the existence of an ancient settlement at the place of the modern village has been proven (with the oldest artifacts dating to the 4th century BC), it is hard to establish any connection with Rhesus' personality. In ancient times, the area was subject to large-scale metallurgical activity, with the largest ancient deposit of slag in Bulgaria. It is believed that the medieval fortress of Castrition lay on Cape Kastrich north of modern Rezovo.
Today's village was first mentioned in Ottoman registers as Rezvi, a village of 41 Christian families. In the 18th century, it was noted as Büyük Rezve ("Big Rezve") and marked as a sea port on Ottoman maps. According to Austrian Wenzel von Bronjar and other 18th-century western travellers, the river mouth at that place had a good wharf suitable as a storm and winter shelter. Rezovo has changed its location slightly several times: its oldest known location is the same as today's, at the coast. However, the locals were forced to move inland because of persistent raids by Caucasian Laz pirates, settling during the 19th century in the Kladarsko Bardo area 10 kilometres to the west, also along the Rezovo River. By 1900, that "Old Rezovo" had 70–80 houses and an Eastern Orthodox church of Saint Elijah the Forerunner. The seaside land was not completely abandoned, as it was used as a pasture because of the favourable climate.
In 1903, the residents of Rezovo took an active part in the Bulgarian Ilinden-Preobrazhenie Uprising, seeking unification with their compatriots in the Principality of Bulgaria. However, the revolt was crushed by the Ottoman authorities and most of Old Rezovo was burned to the ground. The surviving locals settled on the coast, approximately where the oldest known incarnation of the village had been. The Church of Saints Constantine and Helena was built in 1906. After the Balkan Wars of 1912–1913, Rezovo became part of the Kingdom of Bulgaria and a limited number of Bulgarian refugees (25 families) from other parts of Eastern Thrace that remained under Ottoman rule settled in the village. According to Lyubomir Miletich's demographic survey of the Ottoman province of Edirne in The Destruction of Thracian Bulgarians in 1913, published in 1918, before the wars Rezovo (Рѣзово) was a village in the district of Vassiliko inhabited by 70 Bulgarian Exarchist families.
After the wars, the main occupation of the locals was charcoal production and logging, with some agriculture, cattle breeding and fishing. Wood and charcoal were exported by means of the wooden pier in the Rezovo River. The population has gradually declined, however, but today Rezovo is a popular beach resort and a spot frequented by tourists because of its southeasternmost location. Until recently, it was part of the border zone and visitors were required to be checked by Border Police officials. As Bulgaria joined the European Union on 1 January 2007, Rezovo became the contiguous EU's southeasternmost point. On 2 January 2007, municipal mayor Petko Arnaudov hoisted the flag of Europe in the village, along with the national and municipal flags, and the street starting from the Bulgarian border sign was renamed the Europe Alley.
- "EU and Bulgarian flag— on the bloc's new border". BNR Radio Bulgaria. 2007-01-03. Retrieved 2008-09-02. Note that the entirety of Cyprus and various Greek islands, including a part of Rhodes, are located further southeast.
- Милетичъ, Любомир (1918). "Статистиченъ прѣгледъ на българското население въ Одринския виляетъ". Разорението на тракийскитѣ българи презъ 1913 година (in Bulgarian). София: Българска академия на науките. p. 294. Retrieved 2008-09-06.
- Инджов, Александър (2007-01-03). "Европейският флаг се развя в най-югоизточната точка на съюза" (in Bulgarian). Черноморски фар. Retrieved 2008-09-06.
- Райчевски, Стоян (2001). "Резово". Крайбрежна Странджа: топоними и хидроними. София: Университетско издателство "Св. Климент Охридски". pp. 51–55. ISBN 954-07-1541-5.
- "Историческа справка: Резово". Община Царево. Archived from the original on 2007-10-10. Retrieved 2008-09-01.
- Генов, Николай (2003-10-03). "Резово— оазис в края на България". Стандарт. Retrieved 2008-09-01.