Region of a Thousand Lakes, Natural wetland region in Haute-Saône, France.

The Plateau des Mille Étangs is a 220 km² area of about 850 ponds in the north-east of Haute-Saône, spread over three plateaus between 310 and 781 m. The ponds, rarely larger than ten hectares, lie among meadows and forest, crossed by earthen dikes and narrow channels; the Breuchin drains the west, the Ognon the east.

During the Middle Ages, local communities transformed natural swamps into artificial fish farming ponds. This conversion became the foundation for economic development that was later shaped by textile and paper mills in the region.

The region earned its nickname 'Little Finland' because of the many water bodies and the way the landscape resembles Finnish lake districts. This name reflects how visitors and locals see the connection between these two places.

The plateau is crossed by 25 streams and about 850 ponds, with marked footpaths and cycle routes linking the villages. The highest plateau around Beulotte-Saint-Laurent is steeper and colder, so plan accordingly. The Grande Pile peat bog nature reserve lies in the south.

The Natura 2000 perimeter was proposed to the European Commission in March 2003 and validated in December 2004, after consultation of the communes from 2002. The site covers 1,590 wetlands, including 600 hectares of ponds and 490 hectares of wet meadows.