Disable geolocation in Safari I have tried to check "Decline without asking" (Translated).

Now, it won't show where I am on maps and so, but even though I use VPN, Google/Facebook/Youtube and other websites know that I am in Sweden? How can I disable this? Say, I want websites to assume that I am in the UK, or in the USA?
Your browser sends its list of preferred languages to websites. With other browsers, this is usually customizable, but not in Safari for macOS. On the Mac, Safari only sends the systemwide preferred languages.

To change it:  → System Preferences → Language &amp; Region.
Beware that doing this will change the locale used by your operating system.

On the other hand, in iOS 10 the systemwide language is set separately from the app-and-website preferred languages. Both can be found under Settings → General → Language &amp; Region.