El Arbolillo is a Mesoamerican archaeological site located in the territory of the current municipality of Tlalnepantla de Baz, in the State of Mexico. It contains the remains of an ancient farming village that developed during the preclassical mesoamerican period, in the west shores of the Texcoco Lake. According to available data, the earliest occupation of this site could be dated to 900 BCE.

• http://en.wikipedia.org/wiki/El Arbolillo