noun
Refers to a route taken by ship or the journey itself. Somewhat literary or formal; in everyday speech, 航路 (こうろ) is more common for 'sea route' and 船旅 (ふなたび) for 'voyage'.
船路はるばる日本からアメリカへ渡った。
I traveled all the way from Japan to America by sea.
この船路は昔、貿易で栄えた。
This sea route flourished with trade long ago.