The Pasión River is a river

River

A river is a natural watercourse, usually freshwater, flowing towards an ocean, a lake, a sea, or another river. In a few cases, a river simply flows into the ground or dries up completely before reaching another body of water. Small rivers may also be called by several other names, including...

 located in the northern lowlands region of Guatemala

Guatemala

Guatemala is a country in Central America bordered by Mexico to the north and west, the Pacific Ocean to the southwest, Belize to the northeast, the Caribbean to the east, and Honduras and El Salvador to the southeast...

. The river is fed by a number of upstream tributaries whose sources lie in the hills of Alta Verapaz

Alta Verapaz

Alta Verapaz is a department in the north central part of Guatemala. The capital and chief city of the department is Cobán. Verapaz is bordered to the north by El Petén, to the east by Izabal, to the south by Zacapa, El Progreso, and Baja Verapaz, and to the west by El Quiché.Also in Alta Verapaz...

. These flow in a general northerly direction to form the Pasión, which then tends westwards to meet up with the Salinas River

Salinas River (Guatemala)

The Salinas is a river in Guatemala. The river is called Chixoy River from its sources in the highlands of Huehuetenango and El Quiché until it reaches the Chixoy hydroelectric dam , where the Río Salama and Rio Carchela converge with the Río Negro...

 at 16°28′52"N 90°32′39"W. At this confluence the greater Usumacinta River

Usumacinta River

The Usumacinta River is a river in southeastern Mexico and northwestern Guatemala. It is formed by the junction of the Pasión River, which arises in the Sierra de Santa Cruz and the Salinas River, also known as the Chixoy, or the Negro, which descends from the Sierra Madre de Guatemala...

 is formed, which runs northward to its eventual outlet in the Gulf of Mexico

Gulf of Mexico

The Gulf of Mexico is a partially landlocked ocean basin largely surrounded by the North American continent and the island of Cuba. It is bounded on the northeast, north and northwest by the Gulf Coast of the United States, on the southwest and south by Mexico, and on the southeast by Cuba. In...

. The Pasión River's principal tributaries are the San Juan River, the Machaquila River, and the Cancuén River.

The riverine drainage system of the Pasión and its tributaries covers an area of over 5,000 km², and forms a watershed

Drainage basin

A drainage basin is an extent or an area of land where surface water from rain and melting snow or ice converges to a single point, usually the exit of the basin, where the waters join another waterbody, such as a river, lake, reservoir, estuary, wetland, sea, or ocean...

 for a substantial portion of the present-day Guatemalan department

Departments of Guatemala

||Guatemala is divided into 22 departments :#Alta Verapaz#Baja Verapaz#Chimaltenango#Chiquimula#Petén#El Progreso#El Quiché#Escuintla#Guatemala#Huehuetenango#Izabal#Jalapa#Jutiapa#Quetzaltenango#Retalhuleu#Sacatepéquez...

 of Petén

Petén (department)

Petén is a department of the nation of Guatemala. It is geographically the northernmost department of Guatemala, as well as the largest in size — at it accounts for about one third of Guatemala's area. The capital is Flores...

's western half.

The Pasión river basin is recognized as an archaeological region or zone, and contains a number of archaeological sites of the pre-Columbian

Pre-Columbian

The pre-Columbian era incorporates all period subdivisions in the history and prehistory of the Americas before the appearance of significant European influences on the American continents, spanning the time of the original settlement in the Upper Paleolithic period to European colonization during...

 Maya civilization

Maya civilization

The Maya is a Mesoamerican civilization, noted for the only known fully developed written language of the pre-Columbian Americas, as well as for its art, architecture, and mathematical and astronomical systems. Initially established during the Pre-Classic period The Maya is a Mesoamerican...

, which to an extent shared some commonalities in Maya architectural style

Maya architecture

A unique and spectacular style, Maya architecture spans several thousands of years. Often the most dramatic and easily recognizable as Maya are the stepped pyramids from the Terminal Pre-classic period and beyond. Being based on the general Mesoamerican architectural traditions these pyramids...

, political history and glyphic conventions

Maya script

The Maya script, also known as Maya glyphs or Maya hieroglyphs, is the writing system of the pre-Columbian Maya civilization of Mesoamerica, presently the only Mesoamerican writing system that has been substantially deciphered...

. Maya ceremonial and urban centers located within the region include Dos Pilas

Dos Pilas

Dos Pilas is a Pre-Columbian site of the Maya civilization located in what is now the department of Petén, Guatemala. It dates to the Late Classic Period, being founded by an offshoot of the dynasty of the great city of Tikal in AD 629 in order to control trade routes in the Petexbatún region,...

, Tamarindito

Tamarindito

Tamarindito is an archaeological site of the Maya civilization located along an escarpment in the Petén department of Guatemala. The city was the capital of the Petexbatún region of the southwestern Petén during the Early Classic period but was displaced by the newly founded conquest state of Dos...

, Altar de Sacrificios

Altar de Sacrificios

Altar de Sacrificios is a ceremonial center and archaeological site of the pre-Columbian Maya civilization, situated near the confluence of the Pasión and Salinas Rivers , in the present-day department of Petén, Guatemala...

, Aguateca

Aguateca

Aguateca is a Maya site located in northern Guatemala's Petexbatun Basin, in the department of Petén. The first settlements at Aguateca date to the Late Preclassic period , and the city was sacked and abandoned in the early 9th century. Aguateca sits on top of a tall limestone bluff, creating a...

, Seibal

Seibal

Seibal, known as El Ceibal in Spanish, is a Classic Period archaeological site of the Maya civilization located in the northern Petén Department of Guatemala. It was the largest city in the Pasión River region....

 and Machaquila

Machaquila

Machaquilá refers to a ruined city of the Maya civilization in what is now the El Peten department of Guatemala. There is also a small Guatemalan village several kilometers from the site that bears the name Machaquilá.-History:...

.