Geomantic omen in Nanjing, the ancient capital

That's not a matter of feng shui, although Nanjing is known as the little golden tomb. But Nanjing is surrounded by water on three sides, and it is easy to work but difficult to keep. It doesn't matter who built the capital there.

Unlike Beijing, which is surrounded by mountains, there is the Great Wall of Wan Li. Defense is easier than work. In the age of cold weapons, even if you are defeated,

If you are trapped, you can persist for more than ten years. Once Nanjing is trapped, it will be over if it is broken.

From the perspective of geomantic omen, the so-called great involvement in Huichuan means that the mountain is high and the water is deep. Nanjing has water but no mountains. Where is Lichuan?