Installation and configuring plug-in Google Multi Language Sitemap If you use nop 3.80 you need to change one line in the web.config file. Old line <add name="SitemapXml" path="sitemap.xml" verb="*" type="System.Web.Routing.UrlRoutingModule" resourceType="Unspecified" preCondition="integratedMode" /> New line <add name="SitemapXml" path="sitemap*.xml" verb="*" type="System.Web.Routing.UrlRoutingModule" resourceType="Unspecified" preCondition="integratedMode" /> You needn't do it for another nop versions. Install plugin and enable it. You can enable/disable multi language sitemap and 'hreflang' attribute. Example of using 'hreflang' attribute. Example of multi language sitemap.