https://www.gamespot.com/articles/fortnite-season-6-map-updates-new-locations-floati/1100-6462091/

As part of Fortnite: Battle Royale Season 6, developer Epic Games has given the Island on which people build, break, loot, and kill as part of the game's Battle Royale mode some tweaks. As detailed in the Fortnite update 6.0 patch notes, there are a number of new locations to check out, and the map has been updated to reflect this.

Although it might be tricky to tell exactly what's changed without actually being on the ground and exploring yourself, there's a few changes that you can see on the map immediately. First of all, loot lake is now been blackened, with a smaller land mass visible in the middle. This landmass is now a floating island, which players can reach by gliding onto it, building up to it, or jumping into the lake and being bounced up to it.