Of course, you can use both, but there is a certain limitation on hive - a maximum of the first 5 tags are usable in the sense that only after these five tags your post can be searched. In practice, this means that the next ones are just an addition, so it's worth choosing tags wisely. The Polish community on the hive uses mainly the polish tag, and I think Poland is rarely used and searched for.

You can take a look at my profile what tags I use for photo posts or at the profiles of other hive photographers.

First of all, the #photography tag