During World War II, again as an ally of Germany, Bulgaria briefly reacquired the coveted portions of Macedonia and Thrace, but the interwar boundaries were restored without much deliberation in 1947 with the agreement of the Soviet Union as well as all of the other major victorious allies. Small deviations from the borders established in the early 1920s have been made for local reasons, but none of them have been of national significance. The 335-mile border with Yugoslavia was drawn in an attempt to follow the high ridges separating the watersheds of the Morava and Vardar river valleys in Yugoslavia from those of the Iskur and Struma valleys in Bulgaria. The border starts in the north at the junction of the Timok River and the Danube, but it follows the river for only about ten miles. Leaving the Timok (with a few exceptions when it must cross river valleys), it remains on high ground until it reaches the tripoint with Greece. Although nationalist Bulgarians continue to feel that Bulgaria's share of Macedonia--which it shares with both Yugoslavia and Greece--is less than just, there are no overt official disputes of the boundary. The border with Greece is 307 miles long--all but forty-nine miles of which are overland. The major portion of it follows higher elevations and ridges in the Rodopi. East of the Struma and Mesta river valleys, insofar as it is feasible, the border is at the dividing line between the Maritsa River basin and those of the streams that flow southward to the Aegean Sea. Following an official visit by the Greek foreign minister to Sofia in 1946, the Bulgarian premier stated that "all territorial claims [between Greece and Bulgaria] are excluded forever." This statement indicates that boundary frictions that had persisted for many years were officially eliminated at that time, and as of 1973 the border was not disputed. The Turkish border is 149 miles long. It follows small rivers and streams for more than 40 percent of its length, but neither they nor the overland sections constitute physical boundaries or barriers of any consequence. The Romanian border follows the Danube River for about 290 miles from the northwestern corner of the country to the city of Silistra and then cuts to the east-southeast for about eighty-five miles across the old province of Dobrudzha. The Danube, with steep bluffs on the Bulgarian side and a wide area of swamps and marshes along much of the Romanian, is one of the better natural river boundaries in Europe. Most of the river islands that might be expected to bridge the gap between the countries are damp and covered with marsh vegetation. They are subject to regular inundation by floodwaters and, therefore, are uninhabited. The line across Dobrudzha is arbitrary and has been redrawn on several occasions. The population of the area that has changed hands is mixed, but most of those who have strong national preferences have been resettled in the country of their choice.