The Great Drop-Off is one of the three drop offs, the others being the Blue Cliff and the Super Drop-Off. However, it is the only one of the three in the first Endless Ocean, and the other two are found in Endless Ocean: Blue World.
The Great Drop-Off is quite notable in terms of local life, considering that it is home to the only Blue Whale in the game, as well as being where the discovery of the Ancient Mother was first made. As a matter of fact, it is the only place where two large whales can be seen in the same place at the same time in the first game. Otherwise, the corals next to the cliff are home to an otherwise unremarkable array of coral-reef fish such as Bicolour Parrotfish and Starck's Demoiselle.