In a 2D skeleton, a junction region indicates a connected component (CC) where a path splits into two or more different branches. In several real applications, structures of interest such as vessels, cables, fibers, wrinkles, etc. may be wider than one pixel. Since the user may be interested in the junction regions but not in the skeleton itself (e.g. in order to segment an object into single branches), it is reasonable to think about finding junction regions directly on objects avoiding skeletoniza-tion. In this paper we propose a solution to find junction regions directly on objects, which are usually elongated structures, but not necessary thin skeletons, with possible protrusions and noise. Our method is based on geodesic operators and is intended to work on binary objects without holes. In particular, our method is based on the analysis of the wavefront evolution during geodesic propagation. Our method is generic and does not require skeletonization. It provides an intuitive and straightforward way to filter short branches and protuberances. Moreover, an elegant and efficient implementation using a max-tree representation is proposed.