The phrase "outer coast" refers to the parts of a coastline that face the open ocean or sea, away from land. It is the area where waves and tides from the ocean directly impact the shore. Full definition
The appearance of large zones of low - oxygen or no - oxygen along exposed outer coasts like Oregon and Washington came as a complete surprise. (dotearth.blogs.nytimes.com)
The outer coast of Louisiana, which Leatherman refers to as «the erosion «hot spot» of the U.S.,» is losing some 50 feet of beach every year. (scientificamerican.com)
In March 1986 Atwater drove west from Seattle toward Neah Bay and Cape Flattery, on the northwestern tip of Washington State, and started searching the beaches, tide marshes, and river estuaries for clues about whether the outer coast had risen or dropped. (discovermagazine.com)