Valley Between the Mountains
The area between one's booty or ass. The area where your anus lies.
Jake and Jessica were very horny after watching 'Sausage Party', and both looked at each other with a look of bestial lust. They began to make out slowly, and it got to the point where they both began to get wet. His penis covered in pre-cum, and her panties soaked all the way through. Jake pulled his cock out of his boxers, and pushed Jessica's face into the couch cushions, and pulled her pants down. He could clearly see her asshole, right smack-dab in the middle of the Valley Between the Mountains. He inserted his thick, throbbing dick into her tiny ass, covering the valley.