The classic [and Indepth] west-to-east Bhutan tour typically involves traveling from the western valleys of Paro, Thimphu, Punakha and Wangduephodrang, Gangtey/Phobjikha, through the central heartlands of Trongsa, and Bumthang, and finally to the eastern districts of Mongar, Trashigang, and Trashiyangtse, with departure from Samdrup Jongkhar [or potentially Guwahati, India]