Khornabuji Castle (Georgian: ხორნაბუჯი), also sometimes known as the Castle of Queen Tamara, is an ancient castle in the eastern part of Georgia. It is located approximately two miles / 3 kilometers north of Dedoplistsqaro in the region of Kakheti. The castle's ruined remains are sited on the imposing Tsiv-Gombori Range. It was probably constructed, originally, at the end of the 1st millennium BC, at which time it was the only fortification controlling the valleys of the Iori and Alazani rivers.