Please answer the following question: Information:  - The Balkan mountain range (Bulgarian and , Latin Serbian Stara planina, "Old Mountain"; ) is a mountain range in the eastern part of the Balkan Peninsula. The Balkan range runs 560 km from the Vrashka Chuka Peak on the border between Bulgaria and Serbia eastward through central Bulgaria to Cape Emine on the Black Sea. The highest peaks of the Balkan Mountains are in central Bulgaria. The highest peak is Botev at 2,376 m, which makes the mountain range the third highest in the country, after Rila and Pirin. The mountains are the source of the name of the Balkan Peninsula.   - Saint George ("Gergios" to 23 April 303), according to legend, was a Roman soldier of Greek origin and officer in the Guard of Roman emperor Diocletian, who ordered his death for failing to recant his Christian faith. As a Christian martyr, he later became one of the most venerated saints in Christianity.  - Bulgaria (tr. '), officially the Republic of Bulgaria (tr. '), is a country in southeastern Europe. It is bordered by Romania to the north, Serbia and Macedonia to the west, Greece and Turkey to the south, and the Black Sea to the east. With a territory of , Bulgaria is Europe's 16th-largest country.  - Berkovitsa ( Bulgarian :  ) is a town and ski resort in northwestern Bulgaria . It is the administrative centre of the homonymous Berkovitsa Municipality , Montana Province and is close to the town of Varshets . As of December 2009 , it has a population of 13,917 inhabitants . Berkovitsa is situated on the northern slope of Kom Peak of the Berkovska Stara Planina Mountain along the valley of the Berkovitsa River , which is a tributary to the Barziya River , at an altitude above sea level 405 m. The town was mentioned for the first time in Ottoman documents of 1488 . It is near the site of an old fortified settlement on the road from Sofia to Lom . The remains of the fortress and a church were discovered on high ground at Kaleto , just to the west of the present - day town . The former settlement was known as early as the reign of King Kaloyan and was mentioned as a border settlement in the period of the Vidin Kingdom . Berkovitsa Glacier , on Livingston Island in the South Shetland Islands , Antarctica , is named for Berkovitsa .  - Montana Province (transliterated: "Oblast Montana") is a province in northwestern Bulgaria, bordering Serbia in the southwest and Romania in the north. It spreads its area between the Danube river and Balkan mountain. As of February 2011, the province has a population of 148,098 inhabitants, on territory of 3,635.5 km². It was named after its administrative centre the city of Montana.  - Varshets (variously transliterated) is a spa town in Montana Province, northwestern Bulgaria. It is the administrative centre of the homonymous Varshets Municipality. As of December 2009, its population is 6,538. The town is located on the northern slopes of the western part of the Balkan mountains in the small valley of the Botunya River, at , 359 metres above sea level. One of the oldest and most popular resorts in northern Bulgaria, it is famous for its curative mineral springs, mild mountain climate, beautiful scenery and a large well-kept park. The town has an excellent tourist infrastructure. There are two spa centres, a polyclinic, numerous rest houses, hotels and also many private lodgings. Varshets has an art gallery, a municipal museum and an Eastern Orthodox church dedicated to Saint George.  - Turkey, officially the Republic of Turkey (Turkish: ), is a transcontinental country in Eurasia, mainly in Anatolia in Western Asia, with a smaller portion on the Balkan peninsula in Southeast Europe. Turkey is a democratic, secular, unitary, parliamentary republic with a diverse cultural heritage. Turkey is bordered by eight countries: Greece to the west; Bulgaria to the northwest; Georgia to the northeast; Armenia, the Azerbaijani exclave of Nakhchivan and Iran to the east; and Iraq and Syria to the south. The Aegean Sea is to the west, the Black Sea to the north, and the Mediterranean Sea to the south. The Bosphorus, the Sea of Marmara, and the Dardanelles, which together form the Turkish Straits, divide Thrace and Anatolia; they also separate Europe and Asia. Turkey's location has given it geopolitical and strategic importance throughout history.  - Greece (' ), officially the Hellenic Republic (Greek: ' ), historically also known as Hellas ("" ), is a country in southeastern Europe.  Greece's population is approximately 10.955 million as of 2015. Athens is the nation's capital and largest city, followed by Thessaloniki.  - A spa is a location where mineral-rich spring water (and sometimes seawater) is used to give medicinal baths. Spa towns or spa resorts (including hot springs resorts) typically offer various health treatments, which are also known as balneotherapy. The belief in the curative powers of mineral waters goes back to prehistoric times. Such practices have been popular worldwide, but are especially widespread in Europe and Japan. Day spas are also quite popular, and offer various personal care treatments.  - The Black Sea is a body of water between Eastern Europe and Western Asia, bounded by Bulgaria, Georgia, Romania, Russia, Turkey, and Ukraine. It is supplied by a number of major rivers, such as the Danube, Dnieper, Rioni, Southern Bug, and Dniester. The Black Sea has an area of (not including the Sea of Azov), a maximum depth of , and a volume of . It is constrained by the Pontic Mountains to the south and by the Caucasus Mountains to the east, and features a wide shelf to the northwest. The longest east-west extent is about .  - Romania is a sovereign state located in Southeastern Europe. It borders the Black Sea, Bulgaria, Ukraine, Hungary, Serbia, and Moldova. It has an area of and a temperate-continental climate. With 19.94 million inhabitants, the country is the seventh-most-populous member state of the European Union. The capital and largest city, Bucharest, with its 1,883,425 inhabitants is the sixth-largest city in the EU.  - Serbia, officially the Republic of Serbia, is a sovereign state situated at the crossroads of Central and Southeast Europe, covering the southern part of the Pannonian Plain and the central Balkans. Relative to its small territory, it is a diverse country distinguished by a "transitional" character, situated along cultural, geographic, climatic and other boundaries. Serbia is landlocked and borders Hungary to the north; Romania and Bulgaria to the east; Macedonia to the south; and Croatia, Bosnia-Herzegovina, and Montenegro to the southwest; it also claims a border with Albania through the disputed territory of Kosovo. Serbia numbers around 7 million residents, and its capital, Belgrade, ranks among the largest cities in Southeast Europe.    What entity does 'berkovitsa' has the relation 'shares border with' with?
Answer:
varshets municipality