“Approximately one-third of all terrestrial high-biodiversity sites straddle national land borders, yet few man-made boundaries are fixed, and international boundaries often alter over time or disappear altogether. This publication makes the compelling case for transboundary conservation approaches and promotes an array of innovative methods based on contemporary principles. It has been developed primarily to provide transboundary conservation managers with advice on how to work more effectively and how to address the challenges that are specific to transboundary conservation”.