IPA: //ˈkoʊstl//
KK: /ˈkoʊstl/
Connected to or located near the area where land meets the sea.
The coastal town is famous for its beautiful beaches.
Coastal → It is formed from "coast" (from Old French *coste*, meaning the land beside the sea) and "-al" (meaning pertaining to). The word "coastal" refers to something that pertains to or is located near the coast.
Think of the word 'coast' which refers to the land by the sea, and remember that 'coastal' means related to that land.