View of the historic town centre of Mayen in the state Rhineland-Palatinate. The town is located in the county district of Mayen-Koblenz in the Eifel region. The urban area is crossed by the river Nette. Mayen consists of a main town and four boroughs and districts. The town centre is known for the medieval town fortification with Castle Genovevaburg, the town's landmark with its castle keep, the "Golo Tower"