Yup. No roads, isolated human settlements. You can kind of see how humping their family members takes place. Four days on the road to find a wife makes your cousin six hours away on foot appear an attractive proposition.
Flying over the place, what strikes you is the lack of roads, footpaths and pretty much any infrastructure at all. Small settlements of perhaps a dozen houses 50 miles from any other signs of human existence leads one to believe the gene pool is pretty shallow in those parts.