This document summarizes different types of coastal landforms including those formed by changes in sea level: rias are flooded river valleys with gently sloping sides; fjords are steep-walled glacial valleys flooded after ice melt; and raised beaches and abandoned coastlines provide evidence of higher former sea levels. Eustatic sea level changes are global in scale due to ice volume changes, while isostatic changes are local and caused by land level changes from glacial rebound or subsidence under ice weight.