This is from a while ago but I didn’t get the memo. It’s a little crazy:

It’s named after Reddit user /u/vaieriepieris, an ESL teacher from Texas, who made it for a map subreddit in 2013.

• There are more Muslims, Hindus, Buddhists, and Communists inside the circle than outside it.
• It “pulls all of this off while being mostly water and including the most sparsely populated country on earth (Mongolia).” (Source).
• It also contains the highest mountain and deepest trench.