noun
marine transportation route; sea lane
Refers to a route used for shipping or maritime transport, often in contexts of logistics, trade, or military strategy.
この海上輸送路は、アジアとヨーロッパを結ぶ重要な航路だ。
This marine transportation route is an important sea lane connecting Asia and Europe.
Compound of 海上 (maritime, on the sea) + 輸送 (transport) + 路 (route). The exact historical derivation is uncertain, but the word is a straightforward modern technical term.