The mountain is more similar to a big cliff formation, rather than a mountain. It has a long and steep sand-colored peak at the top, with the rocks being colored pink at the underside of the mountain.
Role in series
After Marty gets fed up with SpongeBob and Patrick's antics, he pretends the bus is out of fuel and asks Patrick to find a gas station. Patrick goes the wrong way while looking for one, and accidentally falls off the mountain.