Poland, country of central Europe. Poland is located at a geographic crossroads that links the forested lands of northwestern Europe to the sea lanes of the Atlantic Ocean and the fertile plains of the Eurasian frontier. Now bounded by seven nations, Poland has waxed and waned over the centuries, buffeted by the forces of regional history. In the early Middle Ages, Poland’s small principalities and townships were subjugated by successive waves of invaders, from Germans and Balts to Mongols. In the mid-1500s, united Poland was the largest state in Europe and perhaps the continent’s most powerful nation. Yet two and a half centuries later, during the Partitions of Poland (1772–1918), it disappeared, parceled out among the contending empires of Russia, Prussia, and Austria.