The phrase "a vale" is correct and usable in written English.
It can be used to refer to a valley, often in a poetic or literary context.
Example: "The travelers descended into a vale, surrounded by lush greenery and the sound of a babbling brook."
Alternatives: "a valley" or "a hollow".
On some days my own apartment seems like a vale of peace and light".
From the ground, it will be invisible, hidden behind a vale of trees.
In a vale beneath Triglav lie idyllic Lake Bohinj and Lake Bled.
We live in a vale of illusions produced by our own brains.
An athletic, buoyant man most of his life, Mr. Lindsay spent his final years in a vale of adversity.
Approaching the next farmstead on our itinerary, Ms. Fenstermann pointed out a low, elegant bank barn in a vale, flush against a hillside.
Zoom into the glass in her hand and you see the clear liquid it contains is actually a vale of tears, captured as they fall from her eyes.
And in seeking to restore himself and the shattered cosmos, he valiantly passes through a vale of despair, descending into darkness.
It was the one time of the year when she went out into the world looking as though the world was more than a vale of tears.
The vista was as advertised — a vale through chalk hills, a parallax of sloping fields in various shades of green, extending for miles.
