This Book deals with the ecological, biological and conservational aspects of the ecosystem of Manzala Wetland, the largest lake along the Mediterranean coast of Egypt. It comprises the geography, morphometry climatology and water characteristics of the lake; and introduces its biota including flora and vegetation, phytoplankton, zooplankton, benthic fauna, mammals, amphibians and reptiles, birds and fishes. It is forwarded by an executive summary and introduction and ended by the main threats upon the ecosystem, some conservation measures and recommendations, list of references, and an Arabic summary.