Known as "Puppy Mountain," the natural formation has been around for a while, but its popularity soared after a Valentine's Day post by Shanghai-based designer Guo Qingshan, according to Fox News.

Guo's post on Chinese social media app Xiaohongshu, or RedNote, received 120,000 likes within 10 days. On the media platform Weibo, the hashtag #xiaogoushan - Chinese for "Puppy Mountain" - drew ...