The Karluks (also Qarluqs, Qarluks, Karluqs, Old Turkic: 10px10px10px10px, Qarluq, Persian: خَلُّخ (Khallokh), Arabic قارلوق "Qarluq") were a prominent nomadic Turkic tribal confederacy residing in the regions of Kara-Irtysh (Black Irtysh) and the Tarbagatai Mountains west of the Altay Mountains in Central Asia. They were also known as the Gelolu (simplified Chinese: 葛逻禄; traditional Chinese: 葛邏祿; pinyin: Géluólù, customary phonetic: Gelu, Khololo, Khorlo or Harluut).