What does it mean that all the mountains and rivers in summer are rivers, lakes and seas?

It means to describe the long days in summer and the magnificent natural landscapes such as mountains, rivers and lakes.

Among the 24 solar terms, the Spring and Autumn Equinox and the Summer and Winter Solstice are the most obvious, and they are more likely to become the focus of copywriting. In view of the summer solstice, the day is "the longest" and the night is "the shortest", so it is impossible to use gentle brushwork to drive the atmosphere and describe the beauty of summer.

When summer is long, mountains and rivers flourish and rivers and lakes enter the sea. The longest blank in summer makes the stars at night particularly bright. May all the good things happen to you in the longest day. Although the night is short, it is easier to see the fiery surge of life. The longest day of the year, listening to the wind and enjoying the slow time in summer.