A visitor interacts with deer at Nara Park in Nara on January 27, 2025. As peckish deer chase delighted tourists in Japan's temple-dotted Nara Park, a quiet but dedicated team of litter-pickers patrols the stone paths, collecting plastic waste that threatens the animals' health. (Photo by Philip Fong/AFP Photo)

A carnival member performs during a carnival procession of the closing carnival night in the town of Strumica, southeastern North Macedonia, 16 March 2024. North Macedonians are marking Trimery, an Orthodox Christian holiday, when evil spirits are chased away with dance rituals. The holiday marks the beginning of the fasting period ahead of Easter. (Photo by Georgi Licovski/EPA/EFE)

“Hippo Chase”. As we approached the camp the Selinda Reserve of northern Botswana our boat passed by a hippo resting in the water. I turned around to look back at the boat's wake and saw the hippo charging after us! The hippo must've been tired from an all-nighter because he was angry. He rose way up out of the water three times trying to chase our boat! He was coming at us with such force that he created a wake of his own. Photo location: Selinda Reserve of northern Botswana. (Photo and caption by Curtis Simmons/National Geographic Photo Contest)

To mark World Water Day, on March 22nd Solidarités International and its agency BDDP Unlimited will roll out a campaign to build awareness of the scourge of undrinkable water.