The Mariana Trench is a large trench. The only physical appearance of the Mariana Trench is in the episode "Scavenger Pants."
It is a very deep canyon. It has purple edges and contains a few species of plants, unlike in real life. It is located in the Pacific Ocean near the Japanese archipelago in real life.
Role in episode
Squidward tells SpongeBob and Patrick that their next item to find on their scavenger hunt is the Boxing Begonia, which is found in the Mariana Trench. The pair then go to the Marina Trench, but need a rope to climb down. SpongeBob ties a rope he has to a rock and uses it to climb down, but Patrick takes the rope off the rock when trying to find a longer rope for SpongeBob. Patrick then slips down into the trench, and he and SpongeBob end up falling to the trench's bottom, where they find the Boxing Begonia.
The Mariana Trench is a real life trench in the Pacific Ocean, and it is classified as the deepest part of the world's oceans.
The Mariana Trench was previously mentioned in SpongeBob SquarePants Typing, where its name appeared in the "intermediate" group of sentences.