The "Mid-Atlantic Ridge" is an example of divergent boundary.
EXPLANATION:
Divergent boundary can be understood as the tectonic plates, the "divergent boundary" or "divergent plate boundary" is known as a linear feature and are moving apart from one another.
If you were to look around and search for the "most active divergent plate", then the occurrence can be witnessed between oceanic plates and exists as mid-oceanic ridges.