“[The province of Quivira] is the best I have ever seen for producing all the products of Spain.. . the land itself being very fat and black and being very well watered by the rivulets and springs and rivers, . . . I have treated the natives of this province, and all the others whom I found wherever I went, as well as was possible, agreeably to what Your Majesty had commanded. . . . [T]here is not any gold nor any other metal in all that country, and the other things of which they had told me are nothing but little villages.”
—Francisco Vasquez de Coronado, letter to Charles I of Spain
In this excerpt, what does Coronado report that he has discovered?