This is the 2412th most frequent Chinese word.
境內
"境內" means "within a territory" or "domestic."
In this sentence, '境內' is used to specify a location within a specific territory, exemplified by '中國'.
在中國境內有許多美麗的自然景觀。
There are many beautiful natural landscapes within China's territory.
Here, '境內' signifies within the scope of a designated area, referring to '公司'.
我們只在公司境內討論這些敏感問題。
We only discuss these sensitive issues within the company's premises.
In this usage, '境內' describes the area governed or encompassed by '市', referring to municipal boundaries.