What is "k'n-yan"

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.