https://www.gamespot.com/articles/new-pubg-map-sanhok-now-available-on-pc-patch-note/1100-6459893/

A new update is on the way soon for the PC version of PlayerUnknown's Battlegrounds. Patch #15 is scheduled to arrive this Friday, June 22, and will introduce an assortment of UI and sound improvements to the game, as well as the tropical map, Sanhok. [Update: Patch 15 is now available, which means Sanhok is now live in the PC version of PUBG.]

Following several weeks of testing on PUBG's Experimental Server, Sanhok will officially roll out for the live game with Patch 15. The map's most distinctive feature is its size; unlike Erangel or Miramar, Sanhok is 4km x 4km, making it one-fourth as large as PUBG's previous two maps. Despite its smaller scale, it still hosts 100 players, meaning matches are much quicker and more intense when contested on Sanhok.