Chapter 5 is the first of three dedicated to the analysis of environmental images used in decision-making processes of international environmental treaties that protect the environment’s aesthetic value. It draws on philosophies of environmental aesthetics and critical theories for visual art, to examine images created in the process of inscribing natural properties in the World Heritage List for their ‘outstanding universal value’ from an ‘aesthetic’ point of view under the World Heritage Convention. Two kinds of images are identified: verbal images in the Statements of Outstanding Universal Value endorsed by the World Heritage Committee; and photographs submitted by states parties in nominations of natural properties to the World Heritage List in Australia, Chad, China, Kenya and Mexico. It argues that a reasoned determination of aesthetic value by the World Heritage Committee should engage aesthetic concepts and methods to evaluate the aesthetic value of world natural heritage. Aesthetic philosophy would support an account of the photographs as representations of the environment’s aesthetic value, as well as providing an aesthetic basis for interpreting those representations.