Amid drought in southern Texas and northern Mexico, Amistad Reservoir has hit record-low levels.
Image of the Day Land Water Drought
Dry weather is putting extra strain on the systems that deliver water to Mexico City.
Image of the Day Heat Water Drought
Severe drought in Zambia jeopardizes electricity supplies and food security for millions of people.
Image of the Day Water Drought
One of the driest growing seasons in decades has decimated crops and left millions hungry.
In September, low water levels made it more challenging to ship goods down the river and allowed a wedge of saltwater to move upstream.