Dooars  or  Duars  are the  floodplains  and  foothills  of the eastern  Himalayas  in  North-East India  around  Bhutan .  Duar  means door in Assamese,  Nepali , Maithili ,  Bhojpuri , Magahi  and  Bengali  languages, and the region forms the gateway to Bhutan from  India . There were 18 passages or gateways through