Mopan River is a river in 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...

 and the Cayo

Cayo

Cayo may refer to:* Cayo , a 2005 Puerto Rican film starring Roselyn Sánchez* Cayo District, a district in the west of the nation of Belize* Cayo , a hundred, a geographic division, in the county of Carmarthenshire, Wales...

 district in western Belize

Belize

Belize is a constitutional monarchy and the northernmost country in Central America. Belize has a diverse society, comprising many cultures and languages. Even though Kriol and Spanish are spoken among the population, Belize is the only country in Central America where English is the official...

 near the border with 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 Mopan River discharges to the Belize River

Belize River

Belize River is a 180-mile river in Belize that drains more than one-quarter of the country as it winds along the northern edge of the Maya Mountains across the center of the country to the sea just north of Belize City . However, the Belize River/Mopan River Catchment contains over 45 percent of...

 as the Mopan merges with the Macal River

Macal River

The Macal River is a river running through Cayo District in western Belize. Sites along the river include the ancient Mayan town of Cahal Pech and the Belize Botanic Gardens. The Macal River discharges to the Belize River...

; the Belize River in turn terminates at the Caribbean Sea

Caribbean Sea

The Caribbean Sea is a sea of the Atlantic Ocean located in the tropics of the Western hemisphere. It is bounded by Mexico and Central America to the west and southwest, to the north by the Greater Antilles, and to the east by the Lesser Antilles....

. The Belize River/Mopan River Catchment contains over 45 percent of the human population of Belize. A hand cranked vehicle ferry boat conveys visitors to the Xunantunich site across the turbid Mopan River. The Mopan is an important source of drinking water

Drinking water

Drinking water or potable water is water pure enough to be consumed or used with low risk of immediate or long term harm. In most developed countries, the water supplied to households, commerce and industry is all of drinking water standard, even though only a very small proportion is actually...

 and other domestic use for local people living along the Mopan; however, water quality

Water quality

Water quality is the physical, chemical and biological characteristics of water. It is a measure of the condition of water relative to the requirements of one or more biotic species and or to any human need or purpose. It is most frequently used by reference to a set of standards against which...

 is degraded from sediment

Sediment

Sediment is naturally occurring material that is broken down by processes of weathering and erosion, and is subsequently transported by the action of fluids such as wind, water, or ice, and/or by the force of gravity acting on the particle itself....

, nutrient

Nutrient

A nutrient is a chemical that an organism needs to live and grow or a substance used in an organism's metabolism which must be taken in from its environment. They are used to build and repair tissues, regulate body processes and are converted to and used as energy...

 loading, untreated sewage

Sewage

Sewage is water-carried waste, in solution or suspension, that is intended to be removed from a community. Also known as wastewater, it is more than 99% water and is characterized by volume or rate of flow, physical condition, chemical constituents and the bacteriological organisms that it contains...

 discharge, pesticide

Pesticide

Pesticides are substances or mixture of substances intended for preventing, destroying, repelling or mitigating any pest.A pesticide may be a chemical unicycle, biological agent , antimicrobial, disinfectant or device used against any pest...

s and other toxins. The major source of degradation is the extensive deforestation

Deforestation

Deforestation is the removal of a forest or stand of trees where the land is thereafter converted to a nonforest use. Examples of deforestation include conversion of forestland to farms, ranches, or urban use....

 in the upper reaches and non-sustainable agriculture

Sustainable agriculture

Sustainable agriculture is the practice of farming using principles of ecology, the study of relationships between organisms and their environment...

. Karper and Boles have asserted: "The greater Mopan/Belize River Catchment provides a prime example of a watershed under stress from extensive non-sustainable agricultural practices that have occurred within the region over the past three decades." Slash-and-burn agricultural practices by native peoples are contributing to such watershed degradation.

Vicinity Mayan sites

Xunantunich

Xunantunich

Xunantunich is a Maya archaeological site in western Belize, about 80 miles west of Belize City , in the Cayo District. Xunantunich is located atop a ridge above the Mopan River, within sight of the Guatemala border...

, a Mayan

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...

 site, is situated approximately one kilometre from the Mopan River on high ground. Chaa Creek

Chaa Creek

Chaa Creek is a tributary of the Macal River in the Cayo District in western Belize. One of the official gauging stations of the Macal is located near the confluence with Chaa Creek. There are also Maya ruins that remain largely unexcavated in the Chaa Creek catchment basin; certain early...

 is another ancient Mayan site several kilometres to the southwest of the Mopan River within the adjacent Macal River

Macal River

The Macal River is a river running through Cayo District in western Belize. Sites along the river include the ancient Mayan town of Cahal Pech and the Belize Botanic Gardens. The Macal River discharges to the Belize River...

 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...

.