As we walk along the southern bank of the Danube Canal, I am reminded of how important this park-lined waterway is to the natural balance of life in Vienna; how integral it is to the city, while remaining a world apart.
I turn to my companion Franz Essl, an ecologist with the Austrian Environment Agency, who agrees. It’s more than just a question of ecology.
“It’s important for other reasons,” he says. “About 200,000 people live within a couple of hundred metres of it. For some, it’s their only regular contact with nature.”