Bléneau (French pronunciation: [bleno] ⓘ) is a commune in the Yonne department in Bourgogne-Franche-Comté in north-central France, in the historical region of Puisaye.

That natural site is composed of oligotrophic ponds where littorella plants grow and their adjacent damp meadows.

The protected site presents a complexe ensemble of green landscapes, damp or dry, in every stage of plant colonisation.

[6] Humane presence on the territory is present since Palaeolithic, and many silex tools were found, notably by André Huchet on a site near the limit of Bléneau and Saint-Privé.

Approximatively twenty tombs dug directly in coral-rag were discovered, inside which were human remains and a few metallic objects, amon others were a copper ring, an iron belt plate and an iron hook.

Botanical garden combining water and green landscapes, the Jardin d'eau extends on 4 hectares and contains more than 800 plant species, many of them rare or endemic.