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There can be no doubt of its being the Xurumu, one of the tributary streams of the Tacutu, which is well known to the inhabitants of the neighbouring fort of San Joaquim. All the names that figure in the fable of El Dorado are found in the tributary streams of the Rio Branco.

It divides its waters between the Carony, the Rupunury or Rupunuwini, and the Rio Branco, and consequently between the valleys of the Lower Orinoco, the Essequibo, and the Rio Negro. Toward the south, the Tacutu and the Urariquera form together the famous Rio Parima, or Rio Branco. The rivers at the foot of the mountains of Pacaraimo are subject to frequent overflowings.

These names having also been applied to different tributary streams, have caused many errors in geography. The great Rio Branco, or Parime, often mentioned in this work, is formed by the Urariquera and the Tacutu, and flows, between Carvoeyro and Villa de Moura, into the Rio Negro.

The same name being given by the Caribs to the western branch of the Rio Branco has perhaps contributed as much to the imaginary enlargement of the lake Amucu, as the inundations of the various tributary streams of the Uraricuera, from the confluence of the Tacutu to the Valle de la Inundacion.

Thus, notwithstanding the numerous proofs which I have furnished since my return from America, of the non-existence of an inland sea the origin of the Orinoco, a map has been published in my name,* on which the Laguna Parima figures anew. The distance from the mouth of the Mahu to that of the Tacutu is scarcely 0 degrees 40 minutes; La Cruz enlarges it to 7 degrees of latitude.