The Vjosa river runs from Greece, through Albania and the Balkan mountains before reaching the Adriatic sea. This 272km long waterway supports an incredible amount of biodiversity providing a home for 69 different endemic fish species. Vulnerable and endangered animals rely on it to survive, including the Eurasian Lynx which stalks through the forests that line the banks of the river. It is one of the last wild ecosystems in Europe, so untouched that scientists refer to it as a “blank page”. We know less about the Vjosa than we do about the Amazon Rainforest. But in the last year, the river has become the centre of a crucial renewable energy debate happening across Europe.