Warmia is one of the oldest historical regions of Poland. Rich in postgacial moraines, mixed coniferous forests and clear lakes with rare fish species not found in any other parts of Poland Warmia is considered one of the new seven wonders of nature. The region offers a few routes for tourists to stroll along – the Teutonic Knights' Castle Route, the Copernicus Route and the Napoleon Route. Together with Mazury, Warmia is known as the "green lungs" of Poland.