I personally interpret [“surroundings”](https://en.oxforddictionaries.com/definition/surroundings) as at least a plural-only noun but possibly just a noun whose plural form is much more common than its singular form in modern usage.

But on a forum I frequent, a user is claiming that it's actually a mass (uncountable) noun.

I admit that this one is a bit harder to analyse than other words I've thought about, so I'd like to see the thoughts of the English language experts here.