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Shenzhen
A region based on political boundaries is a formal region.
A government defined boundary. It can also be a boundary set up by some form of administration and is not disputable. For example, any city, such as Sydney, Australia.
Some examples of formal regions include countries, states, counties, cities, and school districts. These regions are defined by official boundaries set by governments or other authoritative bodies and have specific characteristics that differentiate them from neighboring areas.
The outer boroughs of the 32 London Boroughs are the formal boundaries. If a district isn't in a London Borough, then it isn't in London. The informal boundary of London is anywhere within the M25 ring road.
divergent faults.
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Its a divergent boundary
An invisible boundary, probably.An invisible boundary, probably.An invisible boundary, probably.An invisible boundary, probably.
Transform boundary
It is called a divergent plate boundary.