Japan is a small country with few energy resources, but it is relatively rich in hydroelectric resources. Analyze the reasons for the abundance of water energy resources in Japan

Japan's islands are mountainous, high in the center and low on both sides, the difference is large, so abundant water resources. The rivers are short, but there is also a relatively large amount of water, such as the Tone River and the Shinano River. Tokyo is also affected by ocean currents. Japan is a mountainous country with a lot of precipitation and "dense" rivers, so it is rich in "water power" resources. Let me explain what hydraulic resources are. It is potential energy, which is generally used for hydroelectric power plants. The word "mountainous" means that there are many differences in altitude. Hydroelectric power plants look for this sudden difference in height and use this drop to create momentum. And there's a lot of rainfall. So, obviously, it's hydropower-rich.