Lake Retba, which is nearly lifeless, is at risk of vanishing due to the impacts of pollution and mining.

- Location – Senegal
- Also known as Lac Rose (Pink Lake).
- Reason for Pink Colour of the lake –
- Due to the proliferation of halophilic green algae (living in a salty environment)
- Caused by the Dunaliella salina bacteria
- Separated by narrow dunes from the Atlantic Ocean
Senegal: Bordered by – Mauritania, Mali, Guinea, Guinea-Bissau and Atlantic Ocean