Tumba-Lediima Nature Reserve is a protected area in the Democratic Republic of the Congo.

It lies immediately east of the Congo River, in Mai-Ndombe and Équateur provinces, and extends from east of the town of Yumbi to just south of the town of Liranga.

[1] It protects a portion of the eastern Congolian swamp forests.

[2] The reserve was designated in 2006, and covers an area of 7411.77 km2.

[1] The reserve, along with Ngiri Triangle Nature Reserve to the northeast, is part of the Triangle de la Ngiri Ramsar Site, a designated wetland of international importance covering 65,696.24 km2.