The location of the negotiations that led to the signing of the Medicine Lodge Creek Treaty was significant for other reasons than simply being a meeting place between the representatives of the United States government and the Native American tribes. This location had been used as a location for ceremonial events and celebrations by the Great Plains tribes for many years. As such, it was probably a sacred spot, one in which, by mutual agreement, tribes set aside their animosities. Howling Wolf may have felt it was important to document the exact location of the signing because it support the impact and importance of the event.
On a purely practical note, Howling Wolf may have wanted to demonstrate that the location was a good place, with plentiful water and grass for grazing the horses that were present, having transported all the people present to that remote area.