continental slope 
noun
The slope between the outer edge of the continental shelf and the deep ocean floor.So today for instance if we go out into parts of the ocean on continental slopes we find methane but under high pressure and low temperature and water it actually forms a solid....
- We then ran down the margin of the Antarctic Peninsula to about 68 degrees W where we slipped off the continental slope into deep water.
- Sperm whales' favourite feeding areas include deep waters around the continental slope west of the British Isles and north towards Iceland.