By “key concepts in Chinese thought and culture” we mean concepts and keywords or phrases the Chinese people have created or come to use that are fundamentally pertinent to Chinese philosophy, humanistic spirit, way of thinking, and values.
Rivers and Mountains / Country or State Power
The term, similar in meaning to heshan (河山), literarily means rivers and mountains. It is used to refer to the sovereignty of a state and all its territory. The term has these implications: rivers and mountains provide natural barriers that protect the country and its sovereignty; territory is the key feature of a state.
To seize a region by force, establish a regime there, and extend its territory far and wide. (The History of the Three Kingdoms)