Fosse Dionne Karst Spring

What makes this place unique

About

Located in Tonnerre within Yonne, Fosse Dionne is a monumental natural pool known for its unexplained depths. It stands out as a unique hydrogeological marvel in France.

Terrain, waters and landscape

Waters

Fosse Dionne is among the most visited natural springs in Yonne. Historically used as a washhouse, its deep underground source remains partly unexplored by divers in France. Its coordinates are available under the Harita section.

Practical notes before you go

Visit

Type: Natural pools
Tip: Respect local safety rules around water and seasonal access.

Related places around here

Nearby

7 items

River

5

River

Yonne River

The river that gives its name to the Yonne department is the most vital waterway in the region. It is a major tributary of the Seine in France .

River

Armançon River

An important part of the hydrological network in Yonne , the Armançon flows through the eastern valleys. It connects directly with the Yonne River in France .

River

Serein River

Flowing through the famous vineyards of Yonne , the Serein River is known for its peaceful valleys. It represents a beautiful natural landscape in France .

River

Cure River

Located in the south of Yonne , the Cure River carves out dramatic, rocky gorges. It flows past prehistoric caves that are famous throughout France .

River

Ouanne River

The Ouanne River is a peaceful western tributary in the Yonne river network. It flows through quiet rural valleys characteristic of central France .

Lakes

1

Lakes

Bourdon Lake

As the largest artificial lake in Yonne , Bourdon Lake is located in the scenic Puisaye area. It was built to regulate water resources in this region of France .

Forest

1

Forest

Puisaye Forest

Spreading across the western part of Yonne , the Puisaye Forest is a dense woodland of oak and beech trees. It is well-regarded for historical timber production in France .