noun
faraway lands across the sea; voyage to distant lands
A yojijukugo evoking the image of crossing vast oceans to reach remote places. Literary and somewhat elevated in tone.
彼は波濤万里の旅に出た。
He set out on a voyage to faraway lands across the sea.
波濤万里を渡ってきた品々が並ぶ。
Goods that have crossed vast oceans are on display.
A yojijukugo composed of 波濤 (waves, billows) and 万里 (ten thousand ri, i.e., a great distance). The exact historical origin is uncertain, but it is a classical Chinese-style expression for distant overseas travel.