What are the nine veins flowing in China when there is a lingyun pen?

This is an essay by Yuan Haowen (119-1257), a great poet in the late Jin Dynasty and early Yuan Dynasty who wrote the famous sentence "Ask the world, what is love?". In Liu Shiju's seven-rhythm poem "Restrain Yunnan", Yuan Haowen uses "Kyushu beyond Kyushu, and the sea color reflects the South Pole", which shows the "nine veins".