Photo of a large modern backyard landscape in santa barbara with natural stone pavers.
Photo by Charles mcclure – professional site planning
Isn’t a boulder just a big rock? well, it depends. the difference between a big rock and a boulder is, well, size. a boulder is generally a rock that is at least 10 inches across. it can be smooth or rugged, rounded or somewhat flat, but it’s the size that sets it apart. every geographic area has its native boulders, whether limestone, honeycomb, moss rock, black basalt or granite.