The phrase "a voyage down" is correct and usable in written English.
It can be used to describe a journey or travel, often implying a descent or movement towards a lower point, either literally or metaphorically.
Example: "The explorers embarked on a voyage down the river, eager to discover new lands."
Alternatives: "a journey down" or "an expedition down".
As a flatboatman, he made a voyage down the Mississippi River to New Orleans, Louisiana.
No, a voyage down the River Nile, a cruise to see the Pyramids.
The Spanish explorer Francisco de Orellana passed through this region in 1541 42 during a voyage down the Amazon from the Coca, one of its Andean headwaters, to its Atlantic estuary.
There was another strange man whom Legh & Smelt had met on the river They had seen him first at Assiut, and again on their voyage down from Ibrim.
His father was a professor of English at Brown and published five books of poetry, including "Voyages Down, and Other Poems".
No theatre critic in modern times has seen so much, for so long a period or with such undiminished enthusiasm as the Guardian's Michael Billington. Nowwith a half -century of reviewing to his credit he takes a fascinating voyage down his vast,well-stocked Theatre memory-lane, to offer his choice of the favoured 101 Greatest plays ever performed.
Columbus Superconductors--A voyage of discovery.
Many of his songs had Southern themes, but Foster never lived in the South and visited it only once, when he took a riverboat voyage down the Mississippi on his honeymoon.
In 1857, five years after the Birkenhead sunk, the S.S. Central America went down on a voyage from Colón to New York.
This is a followup to his 1982 short film, "Riverdogs," a study of mood -- mostly optimism -- centering on a group of friends who take a spontaneous monthlong voyage down the Colorado River.
He was packing for a voyage that Swimming Cities will make down the Ganges, on homemade boats, in early October.
