K'n-yan (or Xinaián) is a fictional, subterranean land in the Cthulhu Mythos. The underground realm was first described in detail in H. P. Lovecraft's revision of Zealia Bishop's "The Mound" (1940), in which it is discovered by the 16th century Spanish Conquistador Zamacona. Lovecraft also mentions K'n-yan in "The Whisperer in Darkness" (1930) and in his revision of Hazel Heald's "Out of the Aeons" (1935). The people of K'n-yan are sometimes referred to as the "Old Ones", a term of variable meaning in Lovecraft's fiction.