The Amazon Basin is arguably both one of the least-known and the most complex linguistic regions in the world. It is the home of some 300 languages belonging to around twenty language families, plus more than a dozen genetic isolates, and many of these languages (often incompletely documented and mostly endangered) show properties that constitute exceptions to received ideas about linguistic universals. This book provides an overview in a single volume of this rich and exciting linguistic area. The editors and contributors have sought to make their descriptions as clear and accessible as possible, in order to provide a basis for further research on the structural characteristics of Amazonian languages and their genetic and areal relationships, as well as a point of entry to important cross-linguistic data for the wider constituency of theoretical linguists.