The river is significally contaminated with both organic and inorganic substances.
* ^ Monroy, Tania (5 November 2013). "Río Tula con altos niveles de contaminación" (in Spanish). Síntesis. Retrieved 18 January 2015.
Coordinates : 20°35′02″N 99°19′43″W / 20.58389°N 99.32861°W / 20.58389; -99.32861
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