The phrase "wilderness-area" refers to a region that remains largely untouched by human development. When describing such areas, it's important to have a variety of synonyms at your disposal to avoid repetition. Words like "wildlands," "undeveloped tracts," or "nature preserves" can be used to convey a similar meaning. Other alternatives include "backcountry," "untamed regions," "remote places," and "unspoiled wilderness." Additionally, you could use geographic features to describe an area, such as "mountainous terrain," "pristine forests," or "rugged landscapes." By utilizing a diverse range of words, you can paint a vivid picture of a wilderness-area and expand your vocabulary in the process.