Lempa River, Central American waterway flowing 422 km from its sources between Sierra Madre and Sierra del Merendón in southern Guatemala (30.4 km), where it is known as Río Olopa, through Honduras (31.4 km) and El Salvador (360 km) to Pacific Ocean; forms small part of Honduras-El Salvador boundary, where it is called Río Lempa
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The Salvadorian government had plans to build a hydroelectric dam north of the town, the Cimarron Hydroelectric project, that would have diverted flow from the Lempa River and would have increased the flow of water downstream into the Metayate River.