Where is the world's largest indoor snow park?

The world's largest indoor ski area is SnowWorld Landgraaf, the Netherlands (opened 2001) with a total of 35,000 m² of snow. In 2003, the first indoor snowboard FIS WorldCup contest was held in SnowWorld Landgraaf. The world's longest indoor slope with 640 m is in the AlpinCenter in Bottrop/Germany and the world's first indoor black diamond (difficulty rating) with a 31 percent grade is in the SnowFunPark in Wittenburg/Germany. In November 2007 Chill Factore in Manchester, UK opened making it the worlds widest slope at 100m wide at the bottom. In spring 2008 construction started on a fourth 500 metre ski slope at SnowWorld Zoetermeer, The Netherlands. After completion SnowWorld Zoetermeer will be, once again, the largest indoor ski area in the world. From Wikipedia