Riga is a Sub-District (Tehsil/Block/Mandal) in the East Siang District of Arunachal Pradesh. As par Census 2011 information the sub-district code of Riga is 01644. There are about 15 sub-districts in East Siang and Riga is one of them. Bilat, Boleng, Kebang, Kora, Koyu, Mebo, Namsing, Nari, New Seren, Pangin, Pasighat, Rebo Perging, Ruksin, Sille Oyan etc. are other sub-districts in East Siang.There are about 7 villages in Riga sub-district, which you can browse from villages list.