Mobile app Dunav Ultra Mobile app Dunav Ultra is our latest product. Inside the app: Route map, hotels, guest houses, restaurants, shops, POI’s, promotions and discounts. In Bulgarian and English. Expected release in Google Play Store and Apple Store: End of April, 2021 AndroidiOS Mobile application Dunav Ultra Leave an email to be notified since the application is published in the store. You're set! Email Notify me ACCOMMODATIONS RESTAURANTS BIKE SERVICES HIGHLIGHTS