James Henry Rochelle, Life of Rear Admiral John Randolph Tucker
“ 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. ”
