Kangchenjunga and Makalu are rigorous trekking regions. Although parts of Kangchenjunga and Makalu districts are fairly wild, people have been eking out a living on these steep hillsides for generations. There are a number of nice villages but they are spaced widely apart.
Hillsides can be vertical.
It's gorgeous walking up from the low lying green rice paddies of the Terai up through the tea plantations, and up into the rugged alpine territory of the peaks and glaciers. If you love planet earth, you will relish passing through many ecological zones on our way to the high camps. Kanchenjunga is the world's third highest peak. Look down on the green foothills from up there, down into Darjeeling-land. Culturally it's very diverse too.