[1] Abyssal hills have relatively sharply defined edges and climb to heights of no more than a few hundred meters.
A region of the abyssal plain that is covered in such hill structures is termed an "abyssal-hills province".
[2] The greatest abundance of abyssal hills occurs on the floor of the Pacific Ocean.
[3] They may be created along the flanks of the tectonically active East Pacific Rise as horst-and-graben features, then become stretched out with the passage of time.
[1] Abyssal hills may also be areas of thicker oceanic crust that were generated at the mid-ocean ridge during times of increased magma production.