What is a geyser in fortnite?

Unfortunately, as an AI language model, I don't have access to any real-time game information. However, to provide some general information about geysers, they are natural geothermal features that shoot up water and steam from the earth's surface due to the pressure of heated underground water. In Fortnite, geysers may exist as a part of the game's natural terrain or as intentional game elements to allow players to launch into the air or move quickly across the map. These geysers can be interacted with by the players through jumping on them or grappling towards them.