Local, sharply defined patches of rough ground have been detected on long-range sonographs in a region of the eastern Mediterranean dominated by compressional tectonic relief. These patches are grouped either as subcircular to oval craters 1 to 6 km across (some with a central mound and annular trough) or as elongate irregular troughs as much as 6 × 30 km. The patches are interpreted as karst-like areas of collapse breccia (incorporating Messinian evaporites and Pliocene-Quaternary sediments) above surfaces of submarine salt dissolution. One group of the crater-like features is slightly elongate parallel to fold axes in their vicinity, and another is aligned along supposed wrench or thrust faults. The large elongate troughs appear to have originated by submarine dissolution of salt within anticlines, the crests of which have since subsided.