backshore

[bak-shawr, -shohr] /ˈbækˌʃɔr, -ˌʃoʊr/
noun, Geology
1.
the zone of the shore or beach above the high-water line, acted upon only by severe storms or exceptionally high tides.
2.
the area immediately adjacent to a sea cliff.
3.
berm (def 3).
Origin
1915-20; back1 + shore1
backshore in Science
backshore
  (bāk'shôr')   
The area of a shore that lies between the average high tide mark and the vegetation. The backshore is affected by waves only during severe storms. Compare foreshore.