Rulantica is Europa-Park's Nordic-themed water world, open year-round and large enough to be a destination on its own. It has slides, wave pools, play areas, outdoor pools in season, saunas, and quieter paid lounging zones for visitors who want a softer day after the theme park.
It is especially useful when the weather turns or when younger travellers need a break from coaster queues. Buy tickets separately from Europa-Park and check opening hours before planning a two-park day.