Osogovo is a mountain and ski resort between southwestern Bulgaria and northeastern Republic of Macedonia, . It is about 110 km 68.35 mi long and 50 km 31.07 mi wide, the highest peak being Ruen ÃÂ ÃÆÃµÃ½ at 2251 m, which constitutes the main orthographic knot on the very border between Bulgaria and the Republic of Macedonia.
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