Comparing the richest areas of the EU can be a difficult task. This is because the NUTS 1 & 2 regions are not homogenous, some of them being very large regions, such as NUTS-1 Hesse (21,100 km2) or NUTS-1 Île-de-France (12,011 km2), whilst other NUTS regions are much smaller, for example NUTS-1 Hamburg (755 km2). An extreme example is Finland, which is divided for historical reasons into mainland Finland with 5.3 million inhabitants and Åland, an autonomous archipelago with a population of 27,000, or about the population of a small Finnish city.