Google no longer supports the Geo extension to the Sitemap protocol. We recommmend that you tell Google about geographically-based URLs by including them in a regular Web Sitemap.
A Geo Sitemap uses the Sitemap protocol, with additional Geo-specific tags as defined below. Once you've created your Sitemap file, submit it to Google as a general web Sitemap. Here is a sample of a Geo Sitemap entry using Geo-specific tags:
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9"
xmlns:geo="http://www.google.com/geo/schemas/sitemap/1.0">
<url>
<loc>http://www.example.com/download?format=kml</loc>
<geo:geo>
<geo:format>kml</geo:format>
</geo:geo>
</url>
<url>
<loc>http://www.example.com/download?format=georss</loc>
<geo:geo>
<geo:format>georss</geo:format>
</geo:geo>
</url>
</urlset>
Geo-specific tag definition| <geo:format> | Required. | Case-insensitive. Specifies the format of the geo content. Examples include "kml" and "georss". Only supported formats will be indexed. |