If I understood right the Locative is only to be formed in singular (e.g. domi, ruri, ...).
But when it comes to words (especially cities / small islands) that only exist in Plural (e.g. Athenae) we have to form a Locative plural, right?
How is that Locative plural formed?
Is it just always similiar to the Ablative Plural (eg. Athenis)?