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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 the notation "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 notation at the bottom reads: "Latitude of unclear is 36-24-30 N." A detailed notation accompanies a point on the sketch locating Chouteau's Island and reads 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 be to the right hand, it stands in a valley: passing south this valley leads through the sand hills about 5 miles -- when about 2 mi? in the hills leave some grown? trees? to the right the way is good if rightly followed which is easily done"]]