sentences:  That area included territories between the great rivers Sava, Drava, and the Danube–Tisza Interfluve (the territory between the Danube and Tisza rivers).According to modern estimations, the proportion of Hungarians in the Carpathian Basin was around 80% at the end of the 15th century, and non-Hungarians hardly were more than 20% to 25% of the total population.The Hungarian population began to decrease at the time of the Ottoman conquest, The decline of the Hungarians was due to the constant wars, Ottoman raids, famines, and plagues during the 150 years of Ottoman rule.