What did Longsha mean in ancient times?

Geomantic omen, a term used in ancient China, is very suitable for the growth of animals and plants because the soil has been nourished by water containing specific ingredients for a long time, and the dragon is the most sacred auspicious beast in the ancient tradition of China, so the ancients called the nourished and vibrant special land and soil "Dragon Sand". The ancients believed that Longsha could bring wealth and other good luck to people.