In the following list of distances between places on the Amazon, from its mouth to its source in Lake Laracocha, the distances for the Lower Amazon are taken from the best Brazilian authorities that could be consulted; the distances for the Upper Amazon, from the Brazilian frontier to the head of steamer navigation at Borja, were measured by the Peruvian Hydrographical Commission of the Amazon; and the distance from Borja, the head of navigation, to the source of the river in Lake Laracocha, is given as estimated by the best Peruvian authorities.
LIST OF DISTANCES ON THE AMAZON.
| Lower Amazon. Miles. | |
| Atlantic ocean to Para | 75 |
| Para to Breves | 146 |
| Breves to Garupa | 123 |
| Garupa to Porto de Moz | 48 |
| Porto de Moz to Prainha | 96 |
| Prainha to Monte Alegre | 44 |
| Monte Alegre to Santarem | 60 |
| Santarem to Obidos | 68 |
| Obidos to Villa Bella | 95 |
| Villa Bella to Serpa | 137 |
| Serpa to Manaos From the Atlantic to Manaos, 1002 miles. | 110 |
| Manaos to Cudajos | 155 |
| Cudajos to Coary | 84 |
| Coary to Tefé (Ega) | 107 |
| Tefé (Ega) to Fonte Boa | 133 |
| Fonte Boa to Tonantius | 140 |
| Tonantius to San Paulo | 95 |
| San Paulo, mouth of the Yavari river The mouth of the Yavari marks the boundary line between Peru and Brazil on the south side of the Amazon. | 90 |
| Mouth of the Yavari to Tabatinga Brazilian frontier port on the north side of the Amazon. From the Atlantic to Tabatinga, 1825 miles. | 14 |
| Tabatinga to Letitia Peruvian frontier post. | 3 |
| Upper Amazon. Miles. | |
| Letitia to Loreto | 37 |
| Loreto to Pebas | 144 |
| Pebas to Iquitos | 117 |
| Iquitos to Tamshiyacu | 20 |
| Tamshiyacu to mouth of the Ucayali river | 43 |
| Mouth of the Ucayali river to Nauta | 6 |
| Nauta to San Regis | 50 |
| San Regis to Santa Cruz de Parinari | 28 |
| Santa Cruz de Parinari to Parinari | 20 |
| Parinari to Vaca Marina | 41 |
| Vaca Marina to Elvira | 18 |
| Elvira to San Pedro | 41 |
| San Pedro to Fontevera | 15 |
| Fontevera to mouth of the Huallaga river | 22 |
| Mouth of the Huallaga river to Cedro Isla | 15 |
| Cedro Isla to mouth of the Pastaza river | 69 |
| Mouth of the Pastaza river to Barranca | 31 |
| Barranca to Mouth of the Potro river | 19 |
| Mouth of the Potro river to mouth of the Morona river | 12 |
| Mouth of the Morona river to Limon | 12 |
| Limon to Punta Achual | 24 |
| Punta Achual to Borja From the Atlantic to Borja, the head of navigation, 2660 miles. | 48 |
| Borja to Lake Laracocha Source of the Amazon. Length of the Amazon river from its source to its mouth, 3160 miles. | 500 |
HUALLAGA RIVER.
The Huallaga has its source in Lake Chiquicoba, flows by the important central city of Huanaco, and thence in a direction nearly north, for 450 miles, until its confluence with the Amazon. The mouth of the Huallaga is 2430 miles distant from the Atlantic, and its current is about 3 miles per hour. Eighteen feet of water can usually be carried up to Yurimaguas, and steamers ascend 40 miles higher to a place called Rumicallarina; above Rumicallarina the river is navigable for a great distance by canoes. About 8 miles below Yurimaguas the river is divided by an island, on each side of which there are sand-bars that steamers drawing more than 11 feet of water are sometimes unable to pass during the months of June, July and August.
LAGUNA.
Distance from the Atlantic, 2447 miles; current, 3 miles per hour.