costaneres

In a sentence

• Les zones costaneres solen ser molt turístiques.

  Coastal areas are often very touristy.

  Here, 'costaneres' is an adjective describing 'zones', indicating their location near the coast.

• Els pescadors de les viles costaneres tenen una vida dura.

  The fishermen from the coastal towns have a hard life.

  In this sentence, 'costaneres' again functions as an adjective, modifying 'viles' (towns), emphasizing their proximity to the sea.

• Les carreteres costaneres tenen vistes espectaculars.

  The coastal roads have spectacular views.

  Here, 'costaneres' is used as an adjective describing 'carreteres' (roads), indicating these roads run along the coast.