Gravity and topographic data obtained by NASA’s Mercury Surface, Space Environment, Geochemistry and Ranging (MESSENGER) spacecraft are used to estimate the current thickness of Mercury’s crust, with shades of red and white indicating thick crust and shades of blue are thin crust. Smooth plains volcanic units (thin black lines), the youngest crustal material on Mercury, generally correspond to areas of thin crust, while the oldest crustal materials, the intercrater plains, generally correspond to areas of thicker crust. Orthographic projection is centered on 120°E longitude and the Caloris basin is in the upper right.