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It joins the Amazon River 1400 km (870 miles) by river above Pará, and almost rivals it in the volume of its waters. It rises more than 15 m (50 feet) during the rainy season, and vessels may ascend it to the Fall of San Antonio , 1070 km (663 miles) above its mouth; but in the dry months, from June to November, it is only navigable for the same distance for craft drawing about 2 m (from 5 to 6 feet) of water.

According to the treaty of San Ildefonso (1800), the Madeira begins at the confluence of the Guapore with the Mamore . Both of these streams have their headwaters almost in contact with those of the river Paraguay. The junction of the great river Beni with the Madeira is at the Madeira Fall , a vast and grand display of reefs, whirlpools and boiling torrents. Between Guajara-Mirim and this fall, inclusive, the Madeira receives the drainage of the northeastern slopes of the Andes, from Santa Cruz de la Sierra to Cuzco, the whole of the south-western slope of Brazilian Mato Grosso and the northern one of the Chiquitos sierras, an area about equal to that of France and Spain. The waters find their way to the falls of the Madeira by many great rivers, the principal of which, if we enumerate them from east to west, are the Guapore or Itenez , the Baures and BlancoBlanco Webb was a character in the BBC sitcom Porridge played by David Jason. Unusually for Jason, who was, at the time, in his thirties, Blanco is a very old man. Blanco is also a close friend of Fletcher. Blanco was imprisoned for murdering his wife., the Itonama or San Miguel , the Mamore , Beni, and Mayutata or Madre de DiosMadre de Dios is a department in south-eastern Peru, bordering Brazil, Bolivia and the Peruvian departments of Puno, Cuzco and Ucayali. Political Capital: Puerto Maldonado. Area: 85,183 km2. Population: 67,008 (1993 census). The department is divided into, all of which are reinforced by numerous secondary but powerful affluents.

All of the upper branches of the river Madeira find their way to the falls across the open, almost level Mojos and Beni plains, 90,000To help compare orders of magnitude of different geographical regions, we list here areas between 10,000 km² and 100,000 km². See also areas of other orders of magnitude. Areas smaller than 10,000 km² 10,000 km² is equal to: 3,863 square miles 1,000,000 h km²Square kilometre (symbol km is an SI unit of surface area. It is one of the SI derived units. 1 km² is equal to: the area of a square measuring 1 kilometre on each side 1 000 000 m² 100 hectares 0. 386 102 square miles (statute) 247. 105 381 acres Convers (35,000 square miles) of which are yearly flooded to an average depth of about 3 feet for a period of from three to four months.

A subspecies of BotoThe Boto or Amazon River Dolphin Inia geoffrensis is a freshwater or river dolphin. It is endemic to the Amazon River and Orinoco River systems. The Boto is the largest of the river dolphins. The IUCN lists Amazon Dolphin Boto Vermelho Bouto Bufeo Dauphin (Amazon River Dolphin) is known to inhabit the Madeira river system.