Wyoming, and though thermal activity exists there, other reports from around the period when Colter was there also indicate observations similar to those Colter had originally described. The exact location of Colter's Hell remains partially contested, as the name could have been applied to several different areas prone to geothermic activity. It is commonly believed that Colter's Hell referred to the region of the Stinking Water, now known as the Shoshone River, particularly the section running through Cody. The river's original title was thanks to presence of sulphur in the surrounding area. His detailed exploration of this region is the first by a white man of what later became the state of Wyoming. Colter's Route It is not known if Colter produced his own crude map that informed Clark's version or if the details were simply dictated to Clark by Colter following his return to St. Louis after a six-year absence. Colter's Route was included in a version of Clark's map, titled "A Map of Lewis and Clark's Track Across the Western Portion of North America from the Mississippi to the Pacific Ocean," which was published in 1814. Clark's original field sketches, drawn on numerous separate sheets that traced the flows of principal rivers as opposed to traditional rectangular or square maps, were shown to President Jefferson in 1807 and did not include Colter's Route, as he was still traveling at the time. A version of these original field maps was produced in 1810 by Clark and Nicholas Biddle so that inaccurate recordings of latitude and longitude could be corrected by astronomer and mathematician Ferdinand Hassler. This 1810 manuscript provided the details of Colter's Route that were published in 1814. Several unexplained geographical discrepancies were printed on the 1814 map, including the Big Horn Mountains and basin being drawn about two times too large, an error believed to be Clark's. The nature behind these discrepancies eludes historians, as Clark had not only his own personal information of the region but information from George Drouillard and John Colter as well. It is likely that Colter never saw Clark's full field maps, as another major discrepancy places Colter's starting point at the midsection of Pryor Creek, as opposed to only geographically likely departing point at the mouth of the Big Horn River. The inaccuracies that plague the 1814 map's details of the area between Manuel's Fort on the Yellowstone and the likely