Iran - especially its capital, Tehran - is facing an unprecedented drought this autumn, with rainfall at record lows and reservoirs nearly empty. Officials are pleading with citizens to conserve water as the crisis deepens, BBC reported.

President Masoud Pezeshkian has warned that if there is not enough rainfall soon, Tehran's water supply could be rationed. But he said that even rationing might not be enough to prevent a disaster.

"If rationing doesn't work," Pezeshkian said, "we may have to evacuate Tehran."