A lake or lake-sea associated with the Carcosa Mythos. With Alar standing upon its shore, it may be a parallel or mirror-image, in some sense, of Lake Hali with Carcosa upon its shore.

In DJ Tyrer's poem Pioneer Approaches Aldebaran, Carcosa stands upon the shore of Demhe on a world orbiting Aldebaran.

According to the Encyclopedia Cthulhiana

Lake whose "cloudy depths" are mentioned in references to Hastur and the King in Yellow. The city of Alar may stand on its store.

See also – Lake Hali

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