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[[This page consists of a sketch map, drawn on a grid, of portions of the Arkansas and Simaron [Cimarron] Rivers. The sketch is bordered by "U.S. Boundary line" at one end and "Rio Del Norte" at the other. Various points of reference and coordinates are part of the sketch. A reference at the bottom reads: "Latitude of unclear is 36-24-30 N." A detailed notation accompanies the point on the sketch locating Chouteau's Island as follows: "Chouteaus Isld. where we turn southd. may be known as a sort of mound like point on the north side of the river, the Island is full of small cotton wood & brush; also at the lower end of it is a thicket of brush & some trees on the south side of the river -- 2 miles or so to the sand hills from the river, a lone tree is to