you can select country in list of countries without highlighting some area finally?

No.

Can you select a physical area that you are going to visit and download that you to your phone for offline use? Yes.

Perhaps you can explain to me: what does selecting an area from a list afford you that highlighting an area visually does not? I've even used this, on a couple of occasions, to download the roadmaps for entire, albeit tiny, countries.

it's much easier than highlighting whole area including nearby countries since most of the countries don't have blocky shape and if you end up highlighting whole country you must highlight also unnecessary areas behind border

you must be really fanboy if you need to have explained how it's choosing package of country/region data superior to highlighting some area

you also forgot to answer how it's offline navigation working in these great Google maps