A map showing country boundaries of Europe as they existed in 1888, including major cities, rivers, and landforms. This map highlights the significance of the use of natural boundaries (rivers and mountains) over cadastral (surveyed or lat/long lines) for determining country borders such as the Krolen Mountains between Norway and Sweden, Ural Mountains between Russia and Asia, Caucasus Mountains between Russia and Asia Minor, the Pyrenees between France and Spain, and the Danube River between Romania and Bulgaria.