An icefield is a large area of ice that covers valleys and mountains. There are a number of synonyms you can use to describe an icefield, including a glacier, ice-sheet or ice-cap. Although these words have slightly different connotations, they all refer to frozen land masses that are created by accumulation and compaction of snow over a long period of time. Some other words you could use to describe an icefield might include a frozen wasteland, a snowfield or a tundra. These words all evoke the image of a cold, barren landscape covered in ice and snow, and are appropriate for various settings and contexts.