"sheer vastness" is a correct and usable phrase in written English.
It is typically used to describe something that is incredibly large or extensive in size or scope. Example: The sheer vastness of the Grand Canyon took my breath away as I stood at the edge, marveling at its beauty and immensity.
But ultimately it's the sheer vastness of Red Reflet that proves its greatest attraction.
Gingrich's lack of organisation on the ground is being exposed by the sheer vastness of Florida.
But here I see it, right in front of my eyes and its sheer vastness is extraordinary.
If I had failed to comprehend the sheer vastness of the reserve before, I got it now.
The sheer vastness and magnificent beauty of the natural setting made me realise how I was merely a guest on the great expanse that is nature.
The sheer vastness of these collections aside, multimedia will prove most beneficial when you use them to highlight, enhance, and illustrate key concepts and skills you would like your students to acquire.
I began to travel in Australia and the sheer beauty and vastness of that continent without any borders planted a deep longing into my cells.
His hopes were disappointed, partly by the sheer inertia, backwardness, and vastness of his domains, partly perhaps because of defects of his own character, but also because Napoleon's aggressive enterprises diverted Alexander's attention to diplomacy and defense.
The sheer improbability of life, the incomprehensible vastness of the cosmos, the ineffable smallness of elementary particles, and the imponderable counter-intuitiveness of quantum mechanics.
The yawning vastness of the void – the sheer volume of negative space left by the underdeveloped stretches of waste ground – dwarfed the inhabited sections of the site, making the houses feel huddled together on the frontier of a dark and impenetrable wilderness".
Kate Dickie plays Jackie, a CCTV operator whose cameras cover a tough Glasgow housing estate and tatty row of shops, dominated by the eerie, cliff-like vastness of tower blocks, whose sheer bulk creates an Arctic updraft of air; the grim unending wind hoists swirling scraps of garbage into the sky, and creates a harsh, almost lunar alienation.
