_St. Johnʼs River_, rises in Ekanfanoga Swamp, and after a winding course of two hundred miles, falls into Apalachia Bay, to the east of Apalachia River. This is said to be the purest of American rivers, receiving in its course no tributary streams, but being fed solely by the springs which exist in its banks; it is two hundred yards broad, and twenty feet deep at the Indian town of Talahosochete in East Florida. There are a few other rivers in East Florida, the names of which are, the Assilla, St. Markʼs river, St. Matheoʼs river, which falls into Apalachia Bay, the Amajura, the Tampa and the Manatte; the two latter of which fall into the Bay del Espirtu Santo, and the Romano, which falls into Carlos harbour; but of these so little is known, as indeed is the case with respect to every thing relating to the Floridas, that a particular description is impracticable. The latitudes and longitudes of many of the above places and rivers, are variously laid down in the maps, and different accounts are given of them by different authors; so that it is not probable that they are exact; the most correct sources of information have been sought, and as no late observations have been made in the country we have been describing, the reader must unfortunately remain satisfied with the imperfect account we are enabled to give of a colony which belonged within the memory of the present generation to Great Britain, but of which, no British author has given an explicit account. The rivers of West Florida, are the boundary stream, the _Rio Perdido_, or Lost River, so called by the Spaniards, because it loses itself for a short distance under ground, and then appears again and empties itself into the Mexican Gulf, in Perdido Bay, which is a large basin, though at its entrance not very wide, yet gradually enlarging till it meets the mouth of the river, which joins it in 87° 26ʹ west longitude, and 30° 26ʹ north latitude, ten leagues east of Mobile Point, and four leagues west of the line of Pensacola. This river stretches to the north-east, and in one place comes within a mile of the Great Lasson, that is to the west of Pensacola harbour. The Rio Perdido, was formerly the boundary between the French and Spanish dominions, and is now considered by the treaty of 1783, as the limit between Mississippi territory and West Florida. By this treaty, the eastern and southern boundaries of Louisiania were fixed, and thus defined; “south on the Gulf of Mexico, from the Bay of St. Bernard, south-west of the Mississippi River, to the mouth of the Rio Perdido, up the Perdido to its source, and thence, (if it rise not north of the 31° of north latitude,) in a straight line north to that parallel, (31° north latitude,) thence along the southern boundary of the United States, west to the Mississipi, then up this river to its source.” The northern and western boundary of Louisiania will be spoken of under the head of New Mexico.