There are several synonyms that can be used in place of "is the edge." Some of these synonyms include brink, rim, verge, perimeter, boundary, and margin. All of these words describe the outermost point or limit of something. For example, a cliff's edge can be described as its brink or rim, while the edge of a property can be referred to as its boundary or perimeter. Utilizing synonyms can add variety and depth to your writing, making it more interesting and engaging for your readers. So, the next time you need to describe the edge of something, consider using one of these synonyms to add a new dimension to your writing.