Is a lake which is situated in the northern highlands of Costa Rica. It is currently the largest lake in Costa Rica at 85-square-kilometre (33 sq mi). Its depth varies between 30 and 60 meters (100–200 feet) seasonally.
The town of Arenal was relocated to higher ground when the lake was expanded in 1979. The old towns of Arenal and Tronadora now lie abandoned at the bottom of the lake, with the new town of Arenal existing to the northeast on the lake.Fish species in Lake Arenal the machaca and the rainbow bass. There are also many species of plants, 120 mammals (including jaguar and tapir), and 300 birds (including quetzal).
From November through April the strong, dependable winds attract windsurfers and kite surfers to its western end. Many consider Lake Arenal one of the world's foremost windsurfing and kite surfing areas. Wakeboarding is gaining popularity in Costa Rica, with Lake Arenal being the center of this activity. Stand up paddling and kayaking are also popular activities for tourists visiting the lake's Eastern part near the earthen dam. There are many good fishing (primarily for rainbow bass) and now kayak fishing opportunities in the shallow and secluded coves. The area surrounding the lake has good hiking, biking, bird watching, and horseback riding opportunities.