Methods to investigate the structure of the Web graph in order to better understand its properties are of interest to many researchers. The scale and complexity of the Web-page digraph is typically managed by aggregating together or clustering individual Web-pages in order to form "Websites". It is the properties of these Websites which then become the focus of research. The most popular Web-page clustering technique is "lexical" and uses the url syntax in order to assign Web-pages to "Websites". Semantic clustering, that is clustering Web-pages according to the similarity of their content has also been proposed. In this paper we consider a third approach to Web-page clustering which is based on the topological properties of the Web-page within the Web-page digraph. We present the technique and report the results of an experiment to compare the use of url-lexically and topologically determined Websites in two sub-domains, one within the Spanish country level domain and the other within the UK country level domain of the Web.