Tropical Islands Resort is a tropical water park located in the former Brand-Briesen Airfield in Halbe, a municipality in the district of Dahme-Spreewald in Brandenburg, Germany, 50 kilometres (31 mi) from the southern boundary of Berlin. It is housed in a former airship hangar (known as the Aerium), the biggest free-standing hall in the world. The hall belonged to the company Cargolifter until its insolvency in 2002.
Tropical Islands has a maximum capacity of 8,200 visitors a day. In its first year of operation it attracted 975,000 visitors, according to the operators. The Tanjong company reported 155,000 visitors in the business year February 2004 to February 2005. Approximately 600 people work at Tropical Islands.
Tropical Islands has a world record for the largest indoor waterpark. It is bigger than Canada's World Waterpark at West Edmonton Mall. It is also the fourth-largest building in the world by usable volume.