BRASILIA, Brazil (AP) — The Negro River, the Amazon’s second largest tributary, on Monday reached its lowest level since official measurements began near Manaus 121 years ago. The record confirms that this part of the world’s largest rainforest is suffering its worst drought, just a little over two years after its most significant flooding.

In the morning, the water level in the city´s port went as low as 13.5 metres (44.3 feet), down from 30.02 metres (98.5 feet) registered in June 2021 — its highest level on record. The Negro River drains about 10 per cent of the Amazon basin and is the world’s sixth largest by water volume.

Madeira River, another main tributary of the Amazon, has also recorded historically low levels, causing the halt of the Santo Antonio hydroelectric dam, Brazil´s fourth largest.

Throughout Brazil´s Amazon, low river levels have left hundreds of riverine communities isolated and struggling to get access to drinkable water. The drought also has disrupted commercial navigation that supplies Manaus, a city of two million with a large industrial park.

Manaus is the largest city and capital of Amazonas, the state hit hardest by the drought. In late September, 55 of 62 municipalities there entered states of emergency due to the severe drought.

“There is no more water to go through. Navigation is over,” boatman Cledson Lopes Brasil told The Associated Press.

Brasil operates in Marina do Davi port, a getaway to dozens of riverine communities, some of them with sandy beaches that attract tourists. The once bustling area is now surrounded by parched soil, with many boathouses high and dry.

For one month now, Brazil has switched to a lower-powered boat, better suited for shallow waters. Still, he can´t reach most communities along Taruma-Açu, a tributary of the Negro River. Some riverine dwellers must walk up to three hours to reach their houses — and tourism has stopped altogether.

Manaus and other nearby cities are also suffering from high temperatures and heavy smoke from nearby man-caused fires for deforestation and pasture clearance. The drought is also the likely cause of dozens of river dolphin deaths in Tefe Lake, near the Amazon River.

This is a startling contrast to July 2021, when Negro River waters took over part of the Manaus downtown area. The historic flood, which also ruined crops of hundreds of riverine communities, lasted for about three months.