Münster is one of the five Regierungsbezirke of North Rhine-Westphalia, Germany, located in the north of the state, and named after the capital city of Münster. It includes the area which in medieval times was known as the Dreingau.
Regierungsbezirk Münster mostly covers rural areas of Münsterland famous for their castles, e.g. Castle Nordkirchen and Castle Ahaus. The region offers more than a hundred castles, all linked up by the cycle path 100 Schlösser Route.
The three southern municipalities are part of the Ruhrgebiet, a densely populated region with much industry. Besides this the area is mostly as green as the rest of Münsterland and historically a part of the landscape.
The history of the Regierungsbezirk dates back to 1815, when it was one of the original 25 Regierungsbezirke created as a subdivision of the provinces of Prussia. The last reorganization of the districts was made in 1975, when the number of districts was reduced from ten to five, and the number of district-free cities from six to three.
Source: https://en.wikipedia.org/wiki/M%C3%BCnster_(region)