High Quality Content by WIKIPEDIA articles! Montabaur (German pronunciation: ) is a town and the district seat of the Westerwaldkreis in Rhineland-Palatinate, Germany. At the same time, it is also the administrative centre of the Verbandsgemeinde of Montabaur – a kind of collective municipality – to which 24 other communities belong. The town is known throughout the country for its strikingly yellow castle and its InterCityExpress railway station on the Cologne-Frankfurt high-speed rail line.