From the Super Mario Wiki
Shiver Mountain in a huge snow-capped mountain on the north-east side of the Mushroom Kingdom in Paper Mario. At the summit is the legendary Crystal Palace and the last Star Spirit. The mountain is between Shiver City and Starborn Valley, and in the middle of Shiver Snowfield. A line of snowmen guards the hidden passage to the mountain, and the bucket and scarf will need to be collected before the climb. The entire way up are thin walkways near cliffs, and covered with White Clubbas and Gulpits. Several puzzles block the way, including a couple of Duplighosts and the use of the Star Stone. On the way up Mario will meet Madam Merlar in a secret crystal chamber. Once Mario activates the Star Stone, the room will be permanently blocked off by a stairway made of ice.
The in-game map description reads, "A mountain path here links Shiver Snowfield with Crystal Palace."
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