Dongelli, Turkey offers 1 beach perfect for sunbathing, surfing, swimming, and more. Dongelli, Duzce, Turkey, is known for its proximity to the stunning natural beauty of the Samandere Waterfall and the lush landscapes of the Duzce region. The best time to travel to Dongelli, Turkey, is in late spring (May to early June) when the average air temperature is around 20-25°C (68-77°F) and the water temperature is approximately 18-20°C (64-68°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!