This chapter describes fronts in, or originating from, semienclosed basins. It begins proposing a general definition of a front and then presents possible spatial and temporal scales attributable to these features. It proposes arguments that support possible values for vertical velocities at fronts. This chapter discusses different types of fronts arising from the conservation equation for property C, which can be salinity, or density, or any dissolved or suspended material. Such different types of fronts are plume and tidal intrusion front, mixing (mostly tidal) fronts, and shear fronts. Concepts in the chapter refer to fronts in semienclosed basins and in coastal oceans, although, in some instances, the concepts may be applicable to oceanic regions.