Feng Shui is a long-standing knowledge in China culture. Through the evolution of time, although it is mixed with superstitious elements, it contains ancient China.

(1)① In order to get enough light and heat, the cave is open to the south; In winter, in order to avoid the north wind, the cave faces south; (3) in order to avoid flood or dehumidification, choose higher ground?

(2) ① The natural water surface around the convex bank can be used for defense; Convex bank is a sedimentary bank, which is beneficial to sediment deposition and soil formation; (3) The water flow is slow, which is convenient for taking water.

(3) The concave bank water has strong erosion and deep water depth.

(1) As can be seen from the first material, the ancient caves faced south, so there was plenty of sunshine and light and heat in the south. And choosing a place with high terrain can avoid some natural disasters. (2) The paddle is located on the convex bank of the river, which is conducive to sediment deposition, so it is safer and of course beneficial to water intake? (3) Anti-bow water refers to the concave bank of the river, where the water flow is fast and the water level is deep, which is very beneficial to the formation of the port.