The great plain, stretches across croatia, serbia, and romania and is highly populated because its fertile soil.

Hungarian

Explanation :

The Great Hungarian Plane which in Hungarian is known as Alfold, occupies most of the Hungary, about 56% of its area. It stretches across the following countries:

The soil is fertile because of the rivers that pass through the plane. River Tisza is the most prominent river of the plane

beaches, climate, and waters