"Boulder-strewn" is an adjective used to describe a location or area which is covered with a large amount of rocks. When looking for synonyms for this term, the following words may come to mind: rocky, stony, pebbly, gravelly, and scree-covered. Each of these words could be used to describe a landscape or terrain that is characterized by its abundance of rocks and stones. However, it's important to keep in mind the context in which these words are used. For instance, "stony" connotes a hardness or unyielding quality, while "pebbly" suggests a smaller size of rocks dispersed throughout an area.