All websites are visible globally, it is unfortunately not possible to restrict them to a specific geographic area. However, most of your visitors will come from the region where you promote it, and having global visitors does not hurt your site or make it more expensive. Does that make sense?
Related questions:
> I see that my website is also live for anywhere in the world, can it only be visible in South Africa?
> How can i run my web in Cape Town only?
> Can I use my site to advertise to by town?