Geku is a Sub-District (Tehsil/Block/Mandal) in the Upper Siang District of Arunachal Pradesh. As par Census 2011 information the sub-district code of Geku is 01665. There are about 11 sub-districts in Upper Siang and Geku is one of them. Gelling, Jengging, Katan, Mariyang, Migging, Mopom, Palling, Singa, Tuting, Yingkiong etc. are other sub-districts in Upper Siang.There are about 11 villages in Geku sub-district, which you can browse from villages list.