Another list defines megacities as urban agglomerations instead of metropolitan areas. A polycentric metropolitan area contains multiple urban agglomerations not connected by continuous development. Kollam is placed 49th in the list of most populous urban agglomerations in India. In 2007, the United Nations listed the world's 100 most populous urban agglomerations. For their ranking, see the list of census metropolitan areas and agglomerations in Canada. It includes the 50 most populated urban agglomerations. Article 165 provides that the law can create agglomerations and federations of municipalities. About 50.35% of the population reside in the urban agglomerations. The list includes the cities and not urban agglomerations. For many, North Rhine-Westphalia is synonymous with industrial areas and urban agglomerations. Estimates for all agglomerations with 300,000 or more inhabitants are included. Internationally, it is one of the thirty most populated urban agglomerations in the world. Many of these urban agglomerations are in China and India. There are two urban agglomerations (UA). Today, it forms one of the largest urban agglomerations in Europe, alongside Moscow.