Laguna (province) producing of fish. Carp and tilapia fingerlings are also being grown in inland ponds and freshwater fish pens. There are a total of 457 operators utilizing an area of for fish pens and fish cages. Aside from the Laguna de Bay, approximately 12% of the area in the Seven Lakes of San Pablo is being used for aquaculture. Laguna is home to twenty-one economic zones as registered under the Philippine Economic Zone Authority. Most of these economic zones are located in Santa Rosa, Biñan, and Calamba. The largest economic zone in Laguna is the Laguna Technopark, located in Santa Rosa
Laguna del Barco Erilla in a round trip hike of , that should take about five hours. Shepherds huts along the route provide shelter. The lake is used as a reservoir, and no camping is allowed in the valley. The route, which is not difficult, passes through country of great natural beauty. Notes Citations Sources Laguna del Barco Laguna del Barco is a glacial lake in the Sierra de Gredos near the town of El Barco de Ávila, in the province of Ávila, Spain. The lake is at an altitude of . It lies in a long glacial valley on the north side