This book offers an up-to-date review and synthesis of the role of tectonics in Neotropical bioregionalisation, in particular transition zones. The main questions are "What are transition zones?", "How would we identify them?" and, "What are the tectonic drivers of transition zones?" These questions are pertinent as they may reveal a new transition zone within the Caribbean (Antillean sub-region), and provides an up-to-date account of the biotectonics of the Caribbean. In addition, the book contains a detailed tectonic summary of the development of the Andes and the bioregionalisation of the South American Transition Zone.