The first human inhabitants of the region were nomadic tribes with a hunting and gathering culture. By the 15th century, the area was inhabited by groups called the "Chumbia", the "Panteca", and the Coixcas. These groups mined salt in what is now Ixtapa. The two main settlements in the area were Xihuacan, which is near the modern Zihuatanejo, and Petatlán. These two settlements along with much of the surrounding area was part of a pre-Hispanic dominion called Cuitlatepan. It extended from the Atoyac River along the coast and inland to the borders of what are now the states of Michoacán and Mexico State. Little remains of these two settlements, mostly because they were abandoned by most of the local inhabitants after being conquered by the Aztecs.