Northern part of the delta is chosen as the study area in order to observe the flood affects on the main city Edirne, and also to watch over the region where three countries borders intersect. (26 ° 9´ 51´´ E 26 ° 47 ´ 44 ´´ E and 42 ° 1 ´ 41 ´´ N - 42° 20 ´ 21 ´´ N, covering approximately 50*50 sq. km.)