Publisher's blurb: The Aldani Basin is an enormous clearing in the jungles of Chult where rainwater collects to form multiple shallow lakes and vast marshy ecosystem. These lakes feed the major northern rivers of Chult, the Soshenstar and the Tath, as they travel from the middle of the jungle out to the sea. Tomb of Annihilation adventure book provides two interesting encounters for the Aldani Basin, Mbala and the Heart of Ubtao. This guide aims to expand on those locations and present them in a logical, easy to run manner that creates a cohesive side quest within the Aldani Basin. It includes encounters with the aldani, the elusive lobsterfolk of Chult, and the pterafolk, rules for running aldani as a playable character race, and a new aldani guide that offers his expertise of the rivers and lakes of Chult. ... A comprehensive guide for Dungeon Masters with 1st-6th level characters. User summary: Use of this product requires Tomb of Annihilation.