I. Some consider the Ganges as the _Sarayuvà_, which Anquetil du Perron calls _Sarjou_. Instead, therefore, of distinguishing two large rivers, they mention only one, and give it the name of the Ganges. This great error is observed in all the maps of India. Father Tiefenthaler is the only author who has avoided it. De l’Isle, for example, in his _Carte des Indes à Paris_ 1781, makes the Ganges and another river take their source from one lake, and says: _Rivière qui fort du même lac que le Gange; elle arrose le Royaume de Thibet_. He then shews how the Ganges directs its course through India; but does not speak a word of the _Sarayuvà_, which, however, is one of the large rivers of that country. II. Father Tiefenthaler and Anquetil du Perron were the first who made a distinction between the Ganges and the _Sarayuvà_; who assigned to each of these rivers a different source, and traced out their proper courses. It is, however, here worthy of remark, that the _Brahmaputra_ ridge of mountains, in which these two geographers make the _Sarayuvà_ or _Sardjou_ take its rise, is called, in the before-mentioned _Amaràsinha_, the mountain _Himala_. We thence find that the Ganges is quite a different river from the _Sarayuvà_; and we at the same time learn the real situation of the mountain _Himala_, the _Imaus_ of the Greeks; for, according to Tiefenthaler’s map, the _Sarayuvà_ has its source in the latitude of 35° north, and the longitude of 78°; but according to M. De l’Isle’s map, in the latitude of 34°, and the longitude of nearly 100°. We observe farther, that the two appellations of the same river, which the old Brahman catalogue in the _Amarasinha_ calls in the Samscred language sometimes _Sarajuvà_, and sometimes _Shadrada_, have been changed into _Sardjou_ and _Gagra_. III. Tiefenthaler and Anquetil make, of the two streams _Sarayuvà_ and _Dèva_, only one, as may be seen in the before-mentioned map. This is a very gross error; for, according to the book _Amarasinha_, the _Dèva_ not only has a different name, but a totally different origin. This river takes its source in the mountain _Sanhya_, and in the Samscred language is called also _Vipasha_ and _Vipal_; both which appellations belong to the _Dèva_ alone, and consequently cannot be given to the _Sarayuvà_.