The state has a large number of ecological attractions most of which are connected to water. The main beaches on the coastline include Puerto Arista, Boca del Cielo, Playa Linda, Playa Aventuras, Playa Azul and Santa Brigida. Others are based on the state's lakes and rivers. Laguna Verde is a lake in the Coapilla municipality. The lake is generally green but its tones constantly change through the day depending on how the sun strikes it. In the early morning and evening hours there can also be blue and ochre tones as well. The El Chiflón Waterfall is part of an ecotourism center located in a valley with reeds, sugarcane, mountains and rainforest. It is formed by the San Vicente River and has pools of water at the bottom popular for swimming. The Las Nubes Ecotourism center is located in the Las Margaritas municipality near the Guatemalan border. The area features a number of turquoise blue waterfalls with bridges and lookout points set up to see them up close.