The Pueblo and Navajo peoples had many names for the Rio Grande in their various languages. These include mets'ichi chena, which is Keresan for "Big River," posoge, which is Tewa for "Big River," paslápaane, which is Tiwa for "Big River," hañapakwa, which is Towa for "Great Waters, and Tó Baʼáadi, which is Navajo for "Female River." The Spanish also had several names for the river simply because they did not realize it was all one river system. They first named it the Río de las Palmas, or “River of the Palms,” for the palm trees that once grew in its delta. In Texas the river was called the Río Pecos, with Pecos derived from the Keresan term for the Pecos Pueblo. The upper portion of the river through New Mexico and Colorado was called the Río del Norte, or “River of the North.” Traders in Mexico named it the Río Conchos, or “Shell River,” for the fossils in the riverbed.