Radisson Hotel Group opens its 18th hotel in Poland with its first Radisson Blu Resort in Ostróda. Radisson Blu Resort & Conference Center, Ostróda Mazury is located in a picturesque location directly on Lake Drwęca in the Masurian Lake District. The resort brings together the tranquility of lakeside living with a variety of leisure activities for travelers as well as a fully equipped conference center.