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Between those two tributary streams coming from the east, lies the mouth of the Rio Idapa, the waters of which are white.

Hence it follows that the Alpine lake of Hortsmann, which has escaped the attention of D'Anville, and which is perhaps situate amid a group of mountains, lies north-east of the portage from the Idapa to the Mavaca, and south-east of the Orinoco, where it goes up above Esmeralda.

The tributary streams on the north, or those of the Orinoco, are the Mavaca and the Daracapo; those on the west, or of the Cassiquiare, are the Idapa and the Pacimoni; and those on the south, or of the Rio Negro, are the Padaviri and the Cababuri. The latter is divided near its source into two branches, the westernmost of which is known by the name of Baria.

They laughed at the supposed communication of the Orinoco with the Rio Idapa, and at the White Sea, which the former river was represented to cross. These good people could not comprehend how men, in making the map of a country which they had never visited, could pretend to know things in minute detail, of which persons who lived on the spot were ignorant.

After six hours' voyage, we passed on the east the mouth of the Idapa, or Siapa, which rises on the mountain of Uuturan, and furnishes near its sources a portage to the Rio Mavaca, one of the tributary streams of the Orinoco. This river has white waters, and is not more than half as broad as the Pacimoni, the waters of which are black. Its upper course has been strangely misrepresented on maps.

May not Surville, from a vague notion of this basin, have imagined, in his map prefixed to Father Caulin's work, an Alpine lake of ten leagues in length, near which, towards the east, rise at the same time the Orinoco, and the Rio Idapa, a tributary stream of the Rio Negro?