Welcome to the Q&A Forum

Hi Osanda, Gareth is right and you, sorry to tell it, are wrong. You can geo target specific sub folders on Google Webmaster Tools, as it can be done for generic domain names (.com, .net...) and subdomains (sk.domain.com...) In order to avoid duplicate content, you can use the rel alternate hreflang tag or in the header section of the pages of your site or directly in the sitemap xml. In case of exact duplicates, then, you can also use the rel=canonical in order to say to Google what of the exact duplicated pages it should present in the index. Said that, in order to geotarget a site, you should also think about getting links from the targeted country. If you are received a lot of links from not Sri Lanka sites, then other local sites (maybe with country level domain name) will rank better than you because they have important links from other local sites.