Situated on the right or south bank of the river; current 2-1/4 miles per hour; width of river, 1800 yards. MAUCALLACTA. Situated on the right or south bank of the river; width of river, 2500 yards. PEBAS. One mile from the Amazon, on the left or north bank, and one mile up the River Ambiyacu. The current of the Amazon at Pebas is 2-1/2 miles per hour; distance from the Atlantic, 2009 miles. ORAM. On south or right bank of the river; current, 2-1/2 miles per hour; width of river, 1000 yards; depth of water, 36 feet. IQUITOS. Latitude, 3 deg. 44' 15" south; longitude, 73 deg. 7' 30" west of Greenwich; magnetic variation, 5 deg. 55' east; thermometer, 78 deg.; elevation above sea-level, 295 feet; distance from the Atlantic, 2126 miles; current, 3 miles per hour; depth of water, 36 feet. Iquitos is on the north bank of the Amazon, at a point where the river is divided by an island into two channels; from the town to the island the river is 1800 yards wide, and the channel on the other side of the island has about the same width. The Government buildings and works are situated at this place, and it is the largest and most important town on the Upper Amazon. It is a place of considerable trade, and in it are established several mercantile houses which import their goods directly from Europe and the United States by way of Para. The anchorage is good at all times, and vessels, whilst discharging or receiving cargo, can lay in security alongside the high bank that lines the whole front of the town. This is an advantage not to be underrated when it is remembered that there are no wharves on the Upper Amazon. TAMSHIYACU. Situated on a high bank on the south side of the river, distant 2146 miles from the Atlantic; thermometer, 76 deg.. At this place the river is narrow, has only one channel, and the current is strong. It is probably the only position on the Amazon, below the mouth of the Ucayali, where vessels could be prevented from passing, up or down, by heavy guns mounted in forts or batteries. MOUTH OF THE UCAYALI RIVER. Latitude, 4 deg. 28' 30" south; longitude, 73 deg. 21' 30" west of Greenwich; magnetic variation, 7 deg. 2' east; thermometer, 80 deg.; elevation above sea-level, 318 feet; distance from the Atlantic, 2189 miles; current in the Amazon, 3 miles per hour; depth of water in the channel of the Amazon, 30 feet; width of the Amazon, 1300 yards. Unfortunately, immediately at the month of the Ucayali neither the banks of that river nor those of the Amazon afford a place suitable for the location of a town. Nauta, on the north bank of the Amazon, seven miles above the mouth of the Ucayali, is the nearest place at which it is practicable to build houses not liable to be swept away by the annual floods. NAUTA.