Leng (plateau)

Leng is a fictional cold arid plateau in the Cthulhu Mythos, whose location seems to vary entirely from story to story. The Plateau of Tsang, referenced by H. P. Lovecraft and other authors, is probably a region of Leng.

Lovecraft's fictional character Abdul Alhazred describes it as a place where different realities converge, which might explain why its precise location cannot be pinned down.

...
Wikipedia