‘Iron Fist': What is K’un-Lun? A Quick Explainer of the Heavenly, Mystical City

Danny Rand gained his superpowers from years of training in the strange city of K’un-Lun — a place that actually exists in another dimension

(Some light spoilers ahead for early episodes of “Marvel’s Iron Fist” on Netflix.)

When Danny Rand (Finn Jones) shows up back in the New York in Netflix’s “Iron Fist,” he’s been missing for some 15 years. Presumed dead in a plane crash over the Himalayas, nobody he knows even believes he really is who he says he is. Where has he been all this time? According to Danny, he was living in a city called K’un-Lun.

Danny returns to New York a changed man from the boy who disappeared at age 10. He’s a martial arts master, and what’s more, he is also the titular Iron Fist. The superhero has the power to channel his chi energy into his fist, granting him super strength.

He also says he’s been serving in K’un-Lun as a warrior, and that his role as Iron Fist is to fight The Hand. That’s the organization of evil ninjas that showed up in the second season of one of Netflix’s other superhero shows, “Daredevil.”

But what, exactly, is K’un-Lun? Danny’s description of the place is cryptic — it’s a capital city of Heaven, he says, and it only appears on Earth once every 15 years. That explains where he’s been, and why it took him so long to return to New York.

The city is located in the real-world Kunlun mountain range that’s found in China. Kunlun Mountain is also a prominent place in Chinese mythology, with the fictional city perhaps giving rise to those real-world myths, although Kunlun Mountain itself is mythological and not real. But K’un-Lun’s similarities to a real place end there.

Danny’s description may sound a bit weird to people not familiar with the mythology, but K’un-Lun has plenty of history in the Marvel comics from which Netflix’s “Iron Fist” is adapted. The mystical city is, in fact, located in another dimension. There are seven capital cities of heaven in total, and all of them phase in and out of the Earthly plane.

Like the realms seen in “Doctor Strange,” another mystical entry into the Marvel Cinematic Universe, K’un-Lun is a place of magic. In fact, it’s usually magic that’s required to get people there. For Danny, it seems he was lucky to wind up in the city, since it only appears on Earth periodically.

K’un-Lun is the Home of the Immortals in the comics, as well as the Iron Fist, a power which passes from warrior to worthy warrior. It’s also home to dragons. In fact, in Danny’s comic origins, he gained the Iron Fist power by claiming defeating a dragon who uses battle to gauge the worth of each new warrior to wield it. It was during that battle that Danny gained the cool dragon tattoo on his chest that serves as the Iron Fist’s symbol.