For this chain-of-thought reasoning and answer, what was the question?
To answer the question, consider the following: Most active divergent plate boundaries occur between oceanic plates and exist as mid-oceanic ridges.
A: between oceanic plates
Q: In plate tectonics, a divergent boundary or divergent plate boundary (also known as a constructive boundary or an extensional boundary) is a linear feature that exists between two tectonic plates that are moving away from each other. Divergent boundaries within continents initially produce rifts which eventually become rift valleys. Most active divergent plate boundaries occur between oceanic plates and exist as mid-oceanic ridges. Divergent boundaries also form volcanic islands which occur when the plates move apart to produce gaps which molten lava rises to fill.

Based on this passage, where are most of the divergent boundaries found?