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Petroglyphs carved into basalt in the western part of the city bear testimony to an early Native American presence in the area, now preserved in the Petroglyph National Monument. The Tanoan and Keresan peoples had lived along the Rio Grande for centuries before European settlers arrived in what is now Albuquerque. By the 1500s, there were around 20 Tiwa pueblos along a 60-mile (97 km) stretch of river from present-day Algodones to the Rio Puerco confluence south of Belen. Of these, 12 or 13 were densely clustered near present-day Bernalillo and the remainder were spread out to the south. Two Tiwa pueblos lie specifically on the outskirts of the present-day city, both of which have been continuously inhabited for many centuries: Sandia Pueblo, which was founded in the 14th century, and the Pueblo of Isleta, for which written records go back to the early 17th century, when it was chosen as the site of the San Agustín de la Isleta Mission, a Catholic mission.