Lake Retba, also known as Lac Rose, lies north of the Cape Verde peninsula in Senegal, some 35 km (22 mi) north-east of the capital, Dakar. It is named for its pink waters caused by Dunaliella salina algae and is known for its high salt content, up to 40% in some areas. Its colour is usually particularly strong from late January to early March, during the dry season. Flooding in September 2022 not only disrupted salt harvesting activities on the lake, but also led the lake to lose its colour, causing a negative effect on tourism. However, as of 2025, the lake has regained some of its colour.