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Bulgaria, in southeastern Europe, is dominated by rugged mountains, except for the Danube lowland in the north that it shares with Romania. Rich farmland in the Danube Valley, 130 kilometers (80 miles) of sandy beaches on the Black Sea, and mountainous terrain characterize one of Eastern Europe's least densely populated nations. Most of the population is urban; about 83 percent are Orthodox Christians, and some 12 percent are Muslim—the Rhodope Mountains, along the border with Greece, are home to many Muslims, including an ethnic Turkish minority.