"Stretch along" is a common phrase used to describe something that extends over a long distance or area. However, there are plenty of other synonyms that can be used to replace this phrase in order to vary one's vocabulary and writing style. Some other options might include "extend across," "span," "reach out over," or "cover a great distance." Depending on the context in which the phrase is being used, other options could include "run alongside," "parallel," "trail behind," or "travel through." By incorporating a variety of synonyms, a writer can keep their language fresh and avoid repetition in their work.