This book presents, through short descriptions and detailed photographs taken during three years of fieldwork, almost three hundred species of aquatic plants found in the lower basin of the Colombian Orinoco. It is written in a language that is accessible to the general public but that does not neglect the scientific and rigorous nature characteristic of botanics. It constitutes the most complete list of aquatic plants of the Colombian Oronoco to date; a product of specimens collected in the field and classified in a herbarium by the authors. One of the goals of this book is to inspire and instruct the reader whether he is sitting at home, studying at University, working at the herbarium or walking through the majestic floodplains of the Colombian Orinoco. In the field, the book helps professional and amateur botanists, Colombian and foreign, and from the plains or any of the country's other regions, to identify the different species. The beauty of the aquatic flora of the Colombian Orinoco, recorded in the photographs, is an incentive to see beyond the apparent monotony of the grasslands that dominate the savannas and to discover among the surales, creeks and Moriche palms and immense and cryptic diversity. After all, the Colombian plains are very diverse and home to unique species that deserve to be studied for their beauty and their ecological importance, and to be protected from the terrible threats they currently face.