H2Oasis Indoor Waterpark is a 56,000 square foot (5,200 m²) Indoor Waterpark located in Anchorage, Alaska just east of the Seward Highway at 1520 O'Malley Road. It opened in 2003 and was at the time, the fifth largest indoor waterpark in the United States.Rides and water features 575-foot-long "Lazy River" circling the park Wave pool generating 3–4 foot waves Mushroom Water Drop and Beached Boat in the wave pool Master Blaster, a 43ft-high and 505ft-long water coaster 12-inch-deep children's lagoon Pirate ship with 7 slides leading to the lagoon Six water cannons 23-foot-high and 150ft-long enclosed body slide, exiting into a three-foot-deep splash pool. Kids water front pool with three slides The water temperature is kept around 84 °F .