How to say to google that my subdomain is targeted to a specific country [closed]

Question 1

EDIT:

Google does not use locational meta tags (like geo.position or distribution) or HTML attributes for geotargeting.

So, you can't use <html lang="en-UK"> as I originally said.

But it seems from here:

The first three elements used for geotargeting are strongly tied to the server and to the URLs used. It's difficult to determine geotargeting on a page by page basis, so it makes sense to consider using a URL structure that makes it easy to segment parts of the website for geotargeting.

that specifying a url, like you did, is enough!

source: http://googlewebmastercentral.blogspot.co.il/2010/03/working-with-multi-regional-websites.html or https://support.google.com/webmasters/answer/182192?hl=en#2

OLD POST:

Google supports rel hreflang

<link rel="alternate" hreflang="es" href="http://www.example.com/" />
<link rel="alternate" hreflang="es-ES" href="http://es-es.example.com/" />
<link rel="alternate" hreflang="es-MX" href="http://es-mx.example.com/" /> 
<link rel="alternate" hreflang="en" href="http://en.example.com/" />

(source: http://googlewebmastercentral.blogspot.dk/2011/12/new-markup-for-multilingual-content.html)

but if you're buying new domains, it's best to have correct ccTLD:

If you use a ccTLD or a gTLD together with Webmaster Tools, then we'll mainly use the >geotargeting from there

(source: http://www.seroundtable.com/seo-geo-location-server-google-17468.html)

see also:

Question 2

You can use the geotargeting tool in Webmaster Tools to indicate to Google that your site is targeted at a specific country. Do this only if your site has a gTLD (generic top-level domain name). However, don’t use this tool if your site targets more than a single country. For example, it would make sense to set a target of Canada for a site about restaurants in Montreal; but it would not make sense to set the same target for a site that targets French speakers in France, Canada, and Mali."

https://support.google.com/webmasters/answer/182192?hl=en#2