Coastal Waters
Coastline
noun, の adjective
The run alongside sea refers to the area along the coast. It can be either the sea that runs alongside the land or the land that runs alongside the sea, making it the coastal waters or the coastline.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
沿海部での生活について、月一でコラムを書いてみませんか。
Would you like to write a monthly column about life in coastal areas?