Aerial view of settlement in Amazon rainforest along the Rio Negro, Manaus, Amazonas, Brazil, South America

Aerial view of housing on the Rio Negro, Manaus, Amazonas, Brazil, South America

Aerial view of stilt houses along Rio Negro, Manaus, Amazonas, Brazil, South America

Aerial of the Congo River, Mbandaka, Equateur province, Democratic Republic of Congo, Africa

Kasai River flowing through Tshikapa, Kasai, Democratic Republic of Congo, Africa

Tshikapa River flowing in the Kasai river in Tshikapa, Kasai, Democratic Republic of Congo, Africa

Kasai River flowing through Tshikapa, Kasai, Democratic Republic of Congo, Africa

Aerial of Saray-Juk ancient settlement on the Ural Rver, Atyrau, Kazakhstan, Central Asia, Asia

Aerial of Saray-Juk ancient settlement on the Ural Rver, Atyrau, Kazakhstan, Central Asia, Asia

Saray-Juk ancient settlement on the Ural River, Atyrau, Kazakhstan, Central Asia, Asia

Meander or bend of the Rhine River at Boppard, left, Boppard, Rhein-Hunsrueck-Kreis district, Rhineland-Palatinate, Germany, Europe

Port of Bhamo on the Irrawaddy or Ayeyarwady River, Kachin State, Myanmar (Birma), Southeast Asia

Woesendorf, cruise ship on the Danube, Wachau valley, Waldviertel region, Lower Austria, Europe

Little Venice on the Regnitz River, Bamberg, Bavaria, Germany, Europe