Explore the seas of Golarion with Pathfinder Lost Omens High Seas, a hardcover setting guide for tabletop roleplaying adventures across the open waters of the Inner Sea. This guide presents detailed gazetteer material for coastal regions, island communities, and underwater locations, providing Game Masters with new settings, story hooks, and local detail to bring maritime campaigns to life. Discover the history, cultures, and current events of notable locations, including the island of Hermea, Mediogalti Island, the Mordant Spire, and the pirate-haunted Shackles. Each featured region includes a major city that can be incorporated into a wide range of adventures. This supplement is designed for Pathfinder players and Game Masters who want to expand their campaigns beyond the mainland.