La Garrotxa is at the high basin of the river Fluvià, the Muga estuary and the Amer and Llémena river beds
In this county you can see two totally different types of countryside. In a large part of the southern half there are more than 40 volcanoes and various lava flows, forming a gentle countryside without dramatic gradients, which is protected by La Garrotxa Volcanic Zone Natural Park. From the Fluvià river valley to the county's northern limits, the landscape changes dramatically, becoming more dramatic and steeper with an abundance of cliffs and gorges. This is the Alta Garrotxa, which is a declared area of natural interest (Espai d'Interès Natural).
This whole area, along with others such as the river Fluvià, forms part of the La Xarxa Natura 2000 (Natural Network 2000), a European initiative to protect the most unique, diverse, rare, well conserved, representative, fragile or vulnerable natural spaces and which share with each other similar characteristics.