Guess What Country! Round 1

Let’s begin a little game, shall we? I’ll give you hints; you guess what country I’m describing. Try not to peak at a map and/or the rest of the internet! Put your choice in the comment section.

Hints:

1.)   In ancient times, it was ruled by three Persian dynasties

2.)   It is one of the last Sultanates in the world

3.)  Its coast is formed by the Arabian Sea
4.)  It isn't Finland