Intertidal zones are coastal areas that fall dry once during each tidal cycle. This chapter demonstrates how high -resolution synthetic aperture radar (SAR) imagery of coastal zones can be used to study morphodynamical changes in these zones, since exposed intertidal flats show up as dark or bright patches on SAR imagery. In addition, submerged sandbanks can cause SAR image signatures through variations of the surface current fi eld. Multifrequency SAR data can be used for the derivation of surface roughness parameters, and the polarimetric decomposition of dual-copolarization SAR data helps in identifying coastal habitats. And fmally, we demonstrate how high resolution SAR imagery can be used for archaeological surveys in areas that are difficult to access.