A Country's Boundary With the Sea
This page is the CodyCross answer for the clue below from Welcome to Japan, Group 575, Puzzle 1 (Bullet Train).
Question is: A Country's Boundary With the Sea
and the answer is: COASTLINE
Word Meaning:
COASTLINE — The shape, outline, or boundary of a coast. (The term coastline is generally used to describe the approximate boundaries at relatively large spatial scales.)
Definitions from Wiktionary.