Khoai
Khoai in Bengali refers to a geological formation specifically in Birbhum , Bardhaman , and Bankura districts of West Bengal , India and some parts of Jharkhand , India that is made up of laterite soil rich in iron oxide , often in the shapes of tiny hills . 
<triplet> Khoai <subj> West Bengal <obj> located in the administrative territorial entity <triplet> West Bengal <subj> India <obj> country <triplet> India <subj> West Bengal <obj> contains administrative territorial entity <subj> Jharkhand <obj> contains administrative territorial entity <triplet> Jharkhand <subj> India <obj> country