On the other side of the coin: Don't try to guess the user's location based on the browser's language preference. It's not as common, but plenty of e-commerce

On the other side of the coin: Don't try to guess the user's location based on the browser's language preference. It's not as common, but plenty of e-commerce type sites try to redirect me to their site for a country that's on an entirely different continent, based on my browser being set for a language that's spoken plenty of other places, too.