Dümbüldek Water, which is believed to be healing, meets its visitors in Karagöllü village of Derince district with its pH level, which is considered important for human health, and its rich mineral content. Visitors who seek healing for many diseases with this water named after Dümbüldek Dede, whose grave is located around the village, also find the opportunity to spend time in touch with nature. For the region, where a country coffee, picnic area, and hiking trails are also available, recreation area works are also continuing.