1. A country or state whose territory includes significant coastline and whose economy, culture, or geography is substantially influenced by proximity to the sea
Portugal is a seaside nation with a rich maritime history.
Portugal é uma nação litorânea com uma rica história marítima.
2. A nation whose population centers or major cities are located near coastal areas
Japan is a seaside nation composed of islands.
Japão é uma nação litorânea composta por ilhas.