08
Oct
Dry wood The Rio Negro, a tributary of the Amazon, is one of the world's largest rivers. In 122 years, the water level of no tributary of the Amazon has dropped so much. The Rio Negro dropped to 12.66 meters (41.5 feet) on Friday due to drought and wildfires, according to Brazil's geological service. This is the shallowest state recorded since measurements were first taken in 1902. And researchers in the port city of Manaus fear water levels could drop further as the dry season continues through most of October. "This is the most severe drought in more than 122…