Review of Barberton Makhonjwa Geotrail - Geosites and Viewpoints. First question – what is a geotrail? Let this book introduce you to the concept and the place. A geotrail is a route that takes us on a journey through remote time and space to geologically important sites and viewpoints (in this case in the Makhonjwa mountains). This is time travel at its best. Geology becomes the tool and the source of organized knowledge to find evidence of the earliest life forms on earth - a band of single cell organisms visible to the naked eye.