FAO

Brazil has the world's largest total renewable freshwater resources — approximately 8,647 cubic kilometers per year, more than any other country and roughly 20 percent of the global total. Russia is second at 4,525 km³/year, Canada third at 2,860 km³/year. But total volume is only part of the story: Canada's per-capita freshwater availability is 36 times higher than China's. And water stress — not total availability — is the defining water challenge of the twenty-first century. This ranking covers the top 20 countries by total renewable freshwater resources, sourced from FAO AQUASTAT, with per-capita comparison and analysis of global water scarcity.