Sinaia () (population: 14,636) is one of the most beautiful mountain resorts of Romania, combining natural beauty with picturesque architecture. The town was named after Sinaia Monastery, around which it was built; the monastery in turn is named after the Biblical Mount Sinai. King Carol I of Romania built his summer home, Peleş Castle, near the town. Sinaia is about 60 km northwest of Ploieşti and 50 km south of Braşov, in a mountainous area on the Prahova River valley, just east of the Bucegi Mountains. The altitude varies between 767 m and 860 m.