Extrema Extrema Outdoor Houthalen-Helchteren Extrema Outdoor Belgium is an electronic dance festival around the beautiful recreational lake of Kelchterhoef in Houthalen-Helchteren near Hasselt. Users who follow Extrema Bahar Zengin Bahar Zengin T H E M E S Thibaut Ghent Terka Tereza Buksová JanVst Jan Van Steenbergen tessenderlo AYYYBEEE Annabeth Brooklyn Sven Breitfeld Sven Breitfeld Kootsj Sam Boelens 9960 Dimi Tristan Colon Tristan Colon Yannick Hufkens Yannick Hufkens