The target area of the Ecological Corridor Project in the Jalapao Region is located in the delineation of three major drainage systems at the regional and national levels: São Francisco, Parnaíba and Tocantins-Araguaia River. The river basin, are actually a river basin level(ANA, 2011), higher territorial participation in the study area is the Tocantins-Araguaia, with 47.48% of the total, followed by the region of Emotions, 32 25%, the remainder of the area located in the São Francisco river, with 20.17%.
The area of the river basin of the Rio Tocantins-Araguaia assisted in the project is located on its east-central portion, involving the river basin level 3 in Sono river and Manuel Alves river in some of its springs. The river basin of Emotions understands its southwestern corner, the region of the headwaters of Emotions, in the presenceof sub-basin level 3 of the Rio Balsas River and Black River-Uruçuí Gurguéia. In the fraction of the São Francisco River regions there is called "Medium / Low Big" tiny fraction of the region and "Great High", both belonging to the sub-basin of the Rio Grande, a tributary of the San Francisco River. According to ANA (2011), the main features of these three river basin districts are:
• Tocantins-Araguaia river: has an area of 967.059km ² (11% of the country) and covers the states of Goiás (26.8%), Tocantins (34.2%), Pará (20.8%), Maranhão (3, 8%), Mato Grosso (14.3%) and the Federal District (0.1%). Much lies in the Central West, from the headwaters of the Araguaia and Tocantins rivers to their confluence, and hence, downstream, enters in the north to its mouth.Approximately 7.9 million people live in the river basin district (4.7% of national population), 72%in urban areas. The population density is 8.1 inhabitants / km ², less than half the national densityof 19.8 inhabitants / km ². Hydrographic Region of Tocantins-Araguaia Amazon biomes are present in the north and northwest, and other areas in the Cerrado;
