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Among the 100 or so attendees who gathered in the city of Villach, nestled in the mountains along the Drava River, was Bert Bolin, a Swedish meteorologist and a pioneer in using computers to model the climate.

The Drava river – which flows out of the Alps through Croatia and Austria and into the Danube – has been constrained historically by farming, hydroelectric dams, and flood control.

In recent years, however, conservationists and government officials have launched major restoration programs to reconnect tributaries and floodplains and to restore riparian areas of the Drava.

After crossing the river Drava, the road takes a right turn and a local police officer points to a beaten path downhill, through the bushes and toward the Hungarian border.

The remaining 330km of the border runs roughly along the Drava river, which is difficult to cross.