The Sia Lagoon is a natural lagoon located on Egypt's North Coast, between Alexandria and Marsa Matruh. It is one of the most important wetlands in the Mediterranean and is home to a variety of marine life. The lagoon's nutrient-rich waters provide a habitat for many species of fish and birds, including the endangered Mediterranean monk seal. The lagoon is also an important area for migratory birds, making it an important stopover for migratory birds that are travelling between Europe and Africa. The lagoon is also home to a number of rare species of plants and animals, making it a key site for scientific research and conservation.