intercoastal       
adjective [ before noun ] (also inter-coastal) uk/ˌɪn.təˈkəʊ.stəl/ us/ˌɪn.t̬ɚˈkoʊ.stəl/
 两岸间的
happening, positioned, or operating between different coasts (= the land at the side of the sea)
  They fish for cod and rockfish in the rough intercoastal waters.
 It looked as though the government intended to foster inter-coastal shipping at the expense of the railroads. 看起来政府似乎打算以牺牲铁路为代价来促进两岸间的航运。 
 - More examples
 - A federal law requires coastal and inter-coastal traffic to be carried in US-built and registered ships.
 - There's been an increase in traffic that moves up rivers and intercoastal waterways.
 - Waterways behind the houses lead out to the intercoastal waterways that surround the city.