Some sections of the river flow through mountain areas with erodible substrates whose bed moulds canyons, narrowing the current and creating ravines. The ravines from the Riaza, Duratón, Lobos, Ebro and Duero rivers stand out. Apart from their charm and beautiful landscapes, they are important because they house lithophytic species like the Griffon Vulture, Egyptian Vulture, Black Stork, Peregrine Falcon, Blue Rock Thrush or the Red-billed Chough.

Other ecosystems:

ATLANTIC BEECH WOOD AND OAK GROVE

STEPPE LAGOON

RESERVOIRS

RIVERS

FLUVIAL MEADOWS

ROCKY MOUNTAINS

HIGH MOUNTAIN BUSHES AND PASTURE

MEDITERRANEAN BUSHES

WASTELANDS

PINE WOODS

CEREAL PLANE

CITIES AND TOWNS

OAK GROVE AND MEADOWS