In most countries, after you select a country/region, this setting won’t change based on your location. If you clear your cookies or use a different device or browser, you’ll need to set it again. Changing your country/region may also change your display language and other settings.
I’m darn sure China is not among most countries in the eyes of Microsoft Bing as no matter how hard I tried to change my region back to Canada, it would always remain People’s Republic of China. DuckDuckGo comes in handy. I love it so much now.