Ngawa Tibetan and Qiang Autonomous Prefecture, also known as
Aba (;
Qiang: Ggabba Shbea Rrmea nyujugvez zhou; ), is an
autonomous prefecture of northwestern
Sichuan, bordering
Gansu to the north and northeast and
Qinghai to the northwest. Its seat is in the
Barkam, and it has an area of . The population was 919,987 in late 2013.