The portion of this section, which is found south of the Columbia river, contains much the most extensive and productive plains and valleys of all Oregon, which are in all respects, by far, the most valuable portions of that country. The most extensive valley here found, is the Wallammette valley, which lies upon the Wallammette river, and is about one hundred and fifty miles in length, and thirty or forty in width, on each side of the river. It is a very beautiful and productive valley, and as it is well timbered, well watered, and as it yields a superabundance of all the grasses, and the various other kinds of vegetation, it is admirably suited to agricultural, and grazing purposes. In the vicinity, and northwest from this valley, are the Fualitine plains, which are about fifty miles in length, and fifteen in width. These are equal in beauty and productiveness, if not superior to the Wallammette valley. They produce the various kinds of vegetation, with much profusion, and they are very well timbered, and well watered; hence their adaptation to the purposes of grazing and farming, are readily seen.
Lansford Hastings, The Emigrants' Guide to Oregon and California. 1st ed. (Cincinnati: George Conclin, 1845). E-book available from www.forbesbookclub.com/bookpage.asp?prod_cd=ICVLC (2001).