"Sustainability" is one of the seven major concepts in the geography curriculum. It is also one of the three cross-curriculum priorities in the Australian curriculum, together with Asia and Australia's engagement with Asia, and Aboriginal and Torres Strait Islander histories and cultures. This paper describes how the concept is explained in the curriculum, explores some of the implications for the teaching of physical geography, discusses the contestability of the concept, and outlines where and how sustainability appears in the curriculum for each year.