It depends on the place.
People who live in a particular place.
There is no requirement you live in any particular place. You can live where you want.
The ecosystem is a collection of all the organisms that live in a particular place, together with their nonliving environment. Something like mineral soil would be an example of a nonliving component.
A niche is the place where a particular organisms are adapted
maybe there are more people of their religion
People may choose to live in a particular area based on job opportunities, proximity to family and friends, affordability of housing, quality of schools, access to amenities such as parks and restaurants, and lifestyle preferences.
where you live or stay at
There are Chinese people in many parts of Ireland, particularly the larger cities and towns. There is no one particular place where they live.
Ecosystem or ecological system
I do not get what your are trying to say. Do you mean where do Mexicans live in U.S.? If that is the question then there is not a particular place in the United States that immigrants live in but there are a lot in Texas.
Maybe with it being often unfamiliar then you might not be able to know your way around the place and you will not be able to live in that particular place.