Lake Madarounfa, or Lac de Madarounfa, is one of the largest wetlands in the Maradi Region of Niger. The lake and the forest located north of it (Madarounfa Forest) are of great importance in both natural and cultural terms, due to the presence of plant and animal habitats in it, in addition to very important heritage sites represented by the tombs of the 99 saints.
Trees dominate the plant life in and around the lake, including the Adansonia digitata and Prosopis africana. As for the fauna, the lake, with its small islands and nearby forests, is a sanctuary for many species of birds such as storks, pelicans, African jacana, African sacred ibis, and European roller.

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Lake Madarounfa was submitted in 2006 to the UNESCO Tentative List in Niger as part of The Classified Forest, the Madarounfa Lake and the Tombs of the 99 Saints.