Answer:
<h2>Taiwan</h2>
Explanation:
<h3>The Republic of China government received Taiwan in 1945 from Japan, then fled in 1949 to Taiwan with the aim to retake mainland China. ... In reality, the PRC rules only Mainland China and has no control of but claims Taiwan as part of its territory under its "One China Principle".</h3>
The house in the middle because it's the closest to an inclined terrain.
It's an area that is organized around a focal/nodal point where there is a central focus. The central diminishes as you move outwards from the point. Generally used to display information about economic activities.
An estuary is where salt water and fresh water meet. Estuaries are usually found at the edge of the coast, where the ocean water, or salty water, meets river, lake, any fresh water source, water.
A tributary is something completely different. It is a, usually smaller than the main river or lake, river/stream stemming off a bigger river or lake, or flowing into that river or lake.