Another large book that deserves another large review. Before I begin, I want to denote that I enjoyed this book and the rules it provides and highly recommend it.
First, the content. Inside you'll find information about the physical geography of the Chult region, of which I particularly liked the hazards of the region. The rules provided in here don't feel like they were designed to feel like other 5e rules, but they're simple enough they won't cause your table to slow down and have to check rules every 5 minutes. A short history of Chult is provided, as well as some information that I presume is collected from 2nd edition or the Forgotten Realms wiki because of how it's formatted. There's a good overview of the factions/groups one might find in the area.
After this comes the regions, which I quite liked. The areas of Chult are broken down into the North Coast, Mistcliffs, Central Chult, Wild Coast, The Peaks of Flame, The Chultengar, Samarch and Thindol. It makes sense to break these regions up since they define the areas topographically. Each region is detailed with how the inhabitants and factions interact with it. Oddly, and this is a point I wasn't happy with, next comes a detailed history of Chult. Either this should be the only history provided, or it should be an appendix. Having two listings of what has happened historically and then separating them by a few pages wasn't a great move.
Next up is adventuring, including things like disasters and sights. There's a lot here that I enjoyed and it supplements the Tomb of Annihilation really well. Something I wish WOTC would take from this supplement is that monsters should always have a listing telling the DM what sourcebook the monster can be found in!
Finally, monsters and there are a lot of them. I'm of two minds about this chapter. D&D 5e has this thing where they'd rather you take something and just reskin it. For example, Tyrannosaurus is a beast that you could easily call Gigantosaurus, Allosaurus, or even Acrocanthosaurus. They're all large theropods (two legged carnivorous dinosaurs). Another examples is in the Monster Manual, how many of the NPCs at the back say "this stat block could easily be used for X, Y and Z". This book went the other way and instead made a lot of dinosaurs when it didn't need to, but I love dinosaurs and it's always good to see some of the lesser known dinosaurs.
Overall, the book is excellent and gives many references to where it pulled this information from. Once more, a high recommendation from this reviewer!