This article discusses the usefulness of studying regional powers through a ‘politics-of-scale’ lens. We argue that this approach, borrowed from political geography, helps to better understand whether and how actors navigate the complex landscape of ‘scales’ in international politics. The combination of regional powers literature with political geography allows us to grasp the unexplored nuances of how power behaviour transcends regional and global levels and what actors (beyond the state) and processes constitute it. We test the empirical applicability of ‘politics-of-scale’ with the help of two country studies within the field of environmental politics: Japan, whose regional power status has been contested, but has used cooperation in the field of environment to establish itself as a regional leader within different spaces of its neighbourhood and Australia, which has reconstructed its climate regionalism in order support domestic politics and related to important domestic interest groups.