Amazon drought leaves Brazil's Rio Negro dry

A fisherman performs maintenance work on his boat as it sits on the dried bed of the Rio Negro in northern Brazil Photograph: Euzivaldo Queiroz/AFP/Getty Images

Boats are left stranded in the Amazon basin near Manaus, Brazil Photograph: Raimundo Valentim/EPA

A man attempts to row through mud along the almost dry Rio Negro in Manaus Photograph: Bruno Kelly/AP

Boats left stranded in the Amazon basin near Manaus Photograph: Raimundo Valentim/EPA

An aerial view showing the scale of the drought Photograph: Raimundo Valentim/EPA

Rubbish lies exposed on the dried bed of the Rio Negro Photograph: Danilo Mello/EPA

Two fishermen sail their boat on what is left of the Rio Negro, 120km from Manaus Photograph: Euzivaldo Queiroz/AFP/Getty Images

Cattle graze on grass on the bed of lake Praquequara on the outskirts of Manaus Photograph: Raimundo Valentim/EPA