Austria might be landlocked, but it has a special relationship with mountains and water. It is home to emerald-green alpine lakes fed by majestic Tyrolean glaciers, and the river that inspired that immortal waltz: “The Blue Danube.” Water was also Austria’s lifeblood ever since it started building hundreds of hydropower plants to propel the economy forward a century ago. It’s hardly a surprise that the country has even had an affectionate nickname for water: They called it “white coal.”