From PathfinderWiki

One of the few buildings on Kyver's Islet not dedicated to industry, Floodfire is in fact a lighthouse. Floodfire is located on the very northern most tip of Kyver's Islet, it was put there to warn people away from the dangerous sandbars that surround the island and the estuary of the Yondabakari River. Floodfire is not a particularly large lighthouse,1 especially when compared with Varisia's most famous lighthouse, The Lady's Light.2