It's really cool to see the natural borders of countries in much higher contrast than a regular elevation map. Especially the Alps walling off Northern-Italy fr

It's really cool to see the natural borders of countries in much higher contrast than a regular elevation map. Especially the Alps walling off Northern-Italy from the rest of the continent and the way the Carpathian basin is surrounded by terrain that made it hard to invade. Makes sense that it was such a heavily contested area around the 9th century.