Crush County is a place located deep within the bottom of the ocean. It makes an appearance in "Squid's on a Bus."
It is a large area with a small city and several geysers. The area is located 80,000,043 fathoms below the ocean's surface, and the pressure found at that depth causes everything to be crushed into a flatter state, hence the name. Several signs that are littered about warn of the massive pressure.
Role in episode
SpongeBob, Patrick, and Squidward end up at the county by crashing their bus through the end of a freeway and falling down to it. The pressure found within the county start to compress them, and Squidward tries to drive out to safety. After a close encounter with the Grim Reaper, SpongeBob tries to help Squidward find his way by unfolding a large map. This causes Squidward to drive into one of the many geysers, launching the bus and everyone on it to the Krusty Krab.
A depth of 80,000,043 fathoms would equate to 146,304,078.638 metres, making Crush County the deepest known place in the ocean. In real life, the Challenger Deep section of the Mariana Trench is the deepest known place in the ocean with a depth of 10,994 metres.