This photo taken on Aug. 16, 2026 in Belgrade, Serbia, shows tree trunks exposed in the Danube River as the river's water level approached record-low by severe drought. (Photo by Wang Wei/Xinhua)

People rest on the bank of the Danube River in Belgrade, Serbia, on Aug. 16, 2026. Riverbed was exposed as the water level of the Danube River approached record-low by severe drought. (Photo by Wang Wei/Xinhua)

People take a stroll on the bank of the Danube River in Belgrade, Serbia, on Aug. 16, 2026. Riverbed was exposed as the water level of the Danube River approached record-low by severe drought. (Photo by Wang Wei/Xinhua)

People cool off in the Danube River in Belgrade, Serbia, on Aug. 16, 2026. Riverbed was exposed as the water level of the Danube River approached record-low by severe drought. (Photo by Wang Wei/Xinhua)

People cool off on the riverbed of the Danube River in Belgrade, Serbia, on Aug. 16, 2026. Riverbed was exposed as the water level of the Danube River approached record-low by severe drought. (Photo by Wang Wei/Xinhua)