海路かいろ
kairo

Noun
Adverb

1. sea route

陸路りくろはこぶのは大変たいへんですが、海路かいろはこぶのは簡単かんたんです。
rikurō hakobu nowa taihendesuga kairode hakobu nowa kantandesu.
It's very difficult to transport them overland, but simple to do so by sea.
Other forms: