Бераинци

thumb|right|200px|Rui mountain Beraintsi (, ) is a small village in Tran Obshtina, Pernik Oblast. It is located in western Bulgaria, 82 km from the capital city of Sofia, 6 km from the town of Tran and 13 km from the border with Serbia. To the north is the Ruy Mountain, which rises 1,706 m above sea level. The village has a permanent population of 15 people, although during the summer period it increases to as many as 150 people. Beraintsi was first mentioned in 1447 as Braintsi. It stems from a family name itself derived from the personal name Beraya, a vocative form of Beray.