basins from the rivers that end at the Gulf of Mexico and they are characterized by his young and impetuous rivers with a great amount of falls. The municipality is located within the basin of the Tecolutla River, and is crossed by the Xucayucan River, bursts in the Southeastern and bathes the central part in direction the southwestern-northwest in a route of more than , until being united to the Teziutanapan and forms the Atexcaco. The Ajocotzingo river, that bathes the Southeastern of the south to north and after a short route it is united to the Xucayucán. The Atexcaco river, that has a long-haul by the central part (more than 7 kilometers or 4.5 miles) until being united to the Apulco. Finally the mighty Apulco river that has a long-haul by the North mountain range; south-north for later outside the municipality being united to the Tecolutla enters the municipality in direction. Also it presents/displays some intermittent streams that are united to the rivers already mentioned. Climate tempered humid with rains all the year. One appears in an area reduced to the south of the municipality. Main ecosystems Most of the municipality is covered with forests, located in the mountainous zones, the associations of pine-encino, and mesófilos mountain forests predominate, with arboreal species such as colored pine, rivets, jaboncillo, to liquidámbar, cedar in the hot part. Fauna Tlacuaches, squirrels, rabbits, armadillos, variety of serpents, spider (tarántulas), capulina spider, and variety of canoras birds. Natural resources Account with forests in which the fine wood abound and of construction. Characteristics of the use of the ground In the territory of the municipality two types of grounds are identified: Andosol. It is predominant ground, percent of the municipality occupies more of the 75 and presents/displays deep lítica phase (rock between in depth). Luvisol. It occupies the margins of the Apulco river, presents/displays deep lítica phase. Sociodemographic profile The ethnic Groups Predominates the ethnic group Náhuatl. Demographic evolution The municipality counts according to the count of population in 1995 of the INEGI, with 6.406 inhabitants, a density of population of 117 inhabitants by square kilometer and one rate of annual growth of 3,24% calculates that for the year the 2000 population ascends to 7,209 reason why will have a density of 131 inhabitants by square kilometer. Account with an index of 0.338 marginalization reason why is considered like stop, reason why it is located