The St. Lucia Estuary is a large estuarine system located on the eastern coast of South Africa. It is part of the iSimangaliso Wetland Park, a UNESCO World Heritage Site, and is known for its rich biodiversity. The estuary is home to various species of fish, birds, and other wildlife, making it an important ecological area. The estuary is formed where the St. Lucia River meets the Indian Ocean. It features a mix of salt and freshwater environments, which support diverse habitats such as mangroves, marshes, and sand dunes. The area is popular for activities like birdwatching, fishing, and eco-tourism.