The Lost World of Tambun (LWOT) is a theme park and hotel in Sunway City Ipoh, Tambun, Kinta District, Perak, Malaysia. Managed by the Sunway Group, the 40-acre park opened on 11 November 2004, and is officiated by Sultan Azlan Shah. With over 80 attractions from 10 parks, including the country's biggest wave pool and longest man-made adventure river, it is surrounded by 400 million old limestone hills over an area of 7,432 m2.