The ocean is a reserve of biodiversity, it regulates the climate and provides a wealth of resources. It is one of our most essential common assets. Given the urgent need for international mobilisation in order to preserve it, science must play a leading role.This book explores the major advances in interdisciplinary research into the ecological, economic and social challenges facing the oceans, which are particularly complex and prominent in the tropical zone, due to the unique characteristics of the oceans in this part of the world.The aim of this richly illustrated educational book is to highlight the many facets of the ocean, as well as solutions for protecting it, through dialogue between all stakeholders. It will captivate anyone with a passion for science and a desire to understand the complexity of the world.