Western San Juan valley and border area within the Dominican Republic, and is the prime source of water tor the Pcligrc Dam, whose irrigation, domestic water, and hydro-electric services arc essential to the economic development and food security of Haiti. The Lago Enriquillo lies in the western part of the Hoya de Enriquillo. Its drainage basin includes ten minor river systems and covers an area of over 3,000 square kilometers. The northern rivers of the system rise in the Sierra de Nciba and arc perennial, while the southern rivers rise in the Sierra de Baomco but only flow after heavy rainfall. Most of the wetlands arc found in the north-central part of the island; Laguna Limon, Laguna Rcdonda and floodplains of the Rio Yuna and Rio Ban·acotc and also in the southeast; Lago Enriquillo, Laguna Limon, Laguna Cabral, Laguna de Oviedo and Laguna Salada. The Puerto Rico l<>laud Ecoregio11: The Freshwater System in Puerto Rico is composed of surface running water, ground water, wetlands, coastal lagoons, a few natural ponds and geothermal springs. There arc also artificial reservoirs, channels for agricultural irrigation and cattle ponds. Most of the wetlands arc in the lower watersheds and the one lake, Cartagena, suffers from high sedimentation rates. All headwaters arc below 1,350 meters elevation. Despite low elevations, Puerto Rico has a highly diversified and complex aquatic ecological system. As usual for the Caribbean, stream flows in Puerto Rico vary widely because the rainfall pattern is influenced by windward I leeward orographic effects, as well as the impact of seasonal storms and hurricanes. There arc 17 major watersheds on the island with chemical composition of stream water reflecting the island's geology (Bogart et a!., 1964). These arc divided into 33 watersheds and sub-watersheds. The largest by drainage area arc: Grande de Loiza, La Plata, Grande de Arccibo, Grande de Ai'iasco, Caliza de Arccibo, Guayanilla and Guajataca. The watersheds were grouped based on a potential historical cotmcctivity, common geology, physiographic and climatic characteristics. In the Northeast there is a complex of small watersheds where the Loiza is the only relatively large river. Topography in the south is flat and the climate is drier than the rest of the island. Its watersheds arc very small, with low flow rate and drainage density but arc subject to flash flooding. Rivers in this part of the island include: Guamani, Scco, Salinas, Coamo, Jacaguas, Tallaboa, Guayanilla, and Yauco. There is also a large wetland system, which has been impacted by intensive agriculture and irrigation channels. Water temperature has no significant variation, ranging fi·om 70°F to 90°F, in contrast to islands such as Hispaniola and Cuba and is a consequence of the island's low elevation. There is turbidity due to sedimentation because of steep topography, heavy rainfall and erodablc soils. Turbidity has also been accentuated by human activities, such as urban development and agriculture. The west of the island has few relatively large watersheds with a high precipitation rate. Although climatic conditions are similar to the northeast, the drainage density is not and catchments surface is larger in the main rivers including Grande de Afiasco, Guanajibo and Culcbrinas. In the northwest, there is a karstic system with low drainage density and few large rivers . . Many of the rivers mn underground, hindering efforts to accurately map their distribution. They include the Guajataca, Camuy, Grande de Arccibo, Grande de Manati, Cibuco, La Plata, and Bayamon. Lesser Antilles Comp/e.y: Ecoregion: The Lesser Antilles arc a chain of islands from the Virgin Islands in the Nm1h to Grenada in the south. As small islands, many areas do not have representatives of tl·cshwatcr biodiversity. The Guadeloupe Archipelago consists of five islands including St Barthelemy and St Martin. The Soufi·icre Mountain is the highest point in the Lesser Antilles at 1,484mcters and is located in the Pare National de Ia Guadeloupe on Basse-Terre. There nrc two main rivers, the Bras-David and Corossol. Donimica is mostly covered by rainforest and has many watcrfhlls, springs and rivers including the La you, L'Or, Macouchcrie, White river and Indian river. Cabrits National Park contains tropical torcst and the largest wetland of the island. Momc Trois Pitons contains several crater lakes and waterfalls. The highest point is Morne Diablotin at I ,438m. MarJinique is mountainous with three principal volcanoes; Mount 10 - 13-