The Glacier of the White Worm is a single, isolated river of ice located some 400 miles south of the Great Glacier itself, and weaving among the highest peaks of the Earthspur Mountains. It flows off a high cliff east of Mulmaster into the Moonsea on one side, and into Lake Icemelt on the other.

This glacier is home to a wide variety of polar creatures, giving rise to the idea that it was once a part of the larger sheet of ice to the north. It survives farther south than even its altitude would justify, and some dweomercraft may be involved.

The area takes its name from the pale albino remorhazes that are unique to the region. It is said that a king of their kind makes its lair in the very center of this domain.

Humans live in the area of the Glacier, primarily mountain barbarian tribes. A group of noble barbarians known as the Tribe of the White Worm is recorded as serving in the army of Zhengyi, the Witch-King of Vaasa. These barbarians are noted as having acquitted themselves well, and to have turned against Zhengyi when the nature of his evil became clear to them.