Boats are the most appropriate transport to connect those villages. You can even see a ferry service marked on OSM which stops at several towns. I've visited si

Boats are the most appropriate transport to connect those villages. You can even see a ferry service marked on OSM which stops at several towns. I've visited similar places, and there are generally water taxis that will take you where you need to go, deliver goods and post etc. Motorised land transport isn't useful in a small, isolated village surrounded by extremely rough terrain. Note the contour lines: https://www.openstreetmap.org/#map=17/8.66221/-77.36813&layers=P https://www.openstreetmap.org/#map=17/8.66221/-77.36813&laye... The walking track is marked as steps on the Colombian side. It ascends about 50m in very roughly 100m distance, then descends equally steeply.