Sia Lagoon is a large natural lagoon located on the North Coast of Egypt. It is an important wetland and bird sanctuary, and is home to a wide variety of wildlife.

The lagoon is located between the Mediterranean Sea and the Gulf of Suez. It is a shallow, brackish body of water, with depths of up to 10 meters and a total surface area of approximately 2,000 hectares. The lagoon is fed by several small rivers and streams, including the Wadi el-Gebel, the Wadi el-Habban, the Wadi el-Shawy, and the Wadi el-Tayeb.

The lagoon is an important habitat for a variety of birds, including the greater flamingo, the white-tailed plover, the black-winged stilt, and the little tern. It is also home to a variety of fish, such as the sea bass, gilthead bream, and mullet. The lagoon is a popular spot for birdwatchers and nature lovers, and is a protected area.

The lagoon is also an important source of food and livelihood for local fishermen, who use traditional methods of fishing, such as nets and lines. The lagoon is also used for aquaculture, and is a popular spot for swimming and recreational activities.

The lagoon is threatened by pollution, overfishing, and the destruction of its natural habitats. In recent years, the Egyptian government has taken steps to protect the lagoon, including the creation of a protected area and the establishment of a management plan.