coastal
coast + -al
https://gyazo.com/6506950e67d17de3b61b83bbabc2da31
source: By Bjørn Christian Tørrissen - Own work by uploader, http://bjornfree.com/galleries.html, CC BY-SA 3.0,
adjective
of or near a coast: 海岸の、海岸に近い
〖通例名詞の前で〗沿岸の, 海岸沿いの
e.g. coastal erosion: 海岸侵食
e.g. coastal waters.: 沿岸水域