The Tallest Mountain (also referred to as Mt. Tallest or the Highest Mountain) is located in the Mountain Range, and it is the highest point on Club Penguin. While the mountain's summit has only been made accessible once, it features prominently in the Mountain Range of Club Penguin Island, and appears in several PSA Secret Missions. It was a members-only party room when the Festival of Flight 2009 started, where it could only be accessed via the Hot Air Balloon Ride. It is so high that in the Case of the Missing Puffles mission, you need special equipment to climb it.