The phrase "a plain of ice" is correct and usable in written English.
It can be used to describe a flat, expansive area covered in ice, often in a geographical or imaginative context.
Example: "The explorers trudged across a vast plain of ice, their breath visible in the frigid air."
Alternatives: "an expanse of ice" or "a field of ice".
It appeared to Carpathias passengers that their ship was in the middle of a vast white plain of ice, studded with icebergs appearing like hills in the distance.
People of the Whale is the story of an Iñupiaq whaling crew, living where the vast plain of ice meets the waters of the Arctic Ocean.
We left the lush greenery of South Island and touched down on the Ross Ice Shelf, a flat plain of floating ice extending to the horizon.
In some areas of Sputnik Planum (an informal name for the plains of ice flows that sit in Pluto's "heart") these water ice mountain clusters span 12 miles across.
Tikigaq was a capital of the pre-contact Arctic, whose prosperity depended on a subtle understanding of the restless plains of ice that surrounded the community in winter.
Smooth, bright plains of ice sat in puddles next to darker regions with cliffs, craters, and chasms.
Today, NASA's New Horizons team unveiled the latest trove of geological goodies in close-up pictures of the surface of Pluto: hummocky hills that rise up above smooth plains of ice, patches of ice pocked by eroded pits, and troughs that form the boundaries of mysterious polygonal structures.
There also appear to be processes working from the bottom up: forces that lift up water ice mountains the size of the Rocky Mountains and allow them to sit next to smooth plains of ice that, the team suspects, have been resurfaced as recently as within the past 100 million years or even last week.
The tone of songs like "Endless Staircase" and "Shoppingtimes" just feel right alongside the flat, featureless plains of ice.
Past the island's north beach, a wind-scarred plain of sea ice stretches uninterrupted to the pole.
