Freshwater ecosystems provide a wide range of goods and services. This ecosystem comprise the Lake, River and Wetlands. Each of these has a unique role, and characteristic linkages to other environmental units. They serves as a habitat to aquatic flora and fauna. A holistic view about this ecology is necessary for better understanding and future management. Such knowledge is the key for the protection and sustainable use of these ecosystems. This Book is a assortment of research papers focusing on the variables in Lakes, Rivers and Coastal Wetlands. Each one is a standalone document of unique research work. The book will helps the readers to obtain an insight regarding Morphometry, Water Quality and Hydrology, Sediment Characteristics, Aquatic eco system, Phytoplanktons, Ostracod and Diatom, Reclamation of soil, Seaweeds, Health status of lagoon and Management Techniques. These features makes this book interesting and indispensible to researchers and decision makers of the Wetland resources in different parts of the World. The book comprises three major sections: • Lakes • Rivers and • Coastal Wetlands