The Greatest extent of the Omani Empire

Westphalian borders in the sense of the Westphalian states. Aka, each of the countries ends at a defined and demarcated line instead of areas of influences. You could think of it as “modern borders”. I don't know if the term is also used in English, but last time I posted it (on Reddit) nobody questioned it, asked about that part, I learnt it at the university in my geography course.