Publisher's blurb: Dive into Aquatic Adventures. Discover what lurks in the briny depths of Golarion's oceans and seas with this supplement, including information about merfolk nations and the dangerous sahuagin and other aquatic terrors that wage war with them. Find lost treasures, explore strange underwater cities, and uncover a wealth of rules options for underwater combat and ways for terrestrial adventurers to adapt to an underwater environment, including new archetypes, feats, and magic items.