salient

1. An outwardly projecting part of a fortification, trench system, or line of defense.
2. A protrusion of the administrative borders of a geopolitical entity, such as a subnational entity or a sovereign state into another geopolitical entity, generally of the same administrative level.
3. An overall-convex, protruding section of a sinuous fold and thrust belt, thrust sheet, or a single thrust fault, caused by one or more of: deformation (folding and faulting) of strata and geologic structures during orogenesis, differences in the angle of critical taper during orogenesis, or differing erosional level of the present geomorphological surface.

الجمع salients