What does the vast sea mean in Wan Li's condensed sentence?

The desert is full of thick ice. "Han Hai" originally refers to the "sea", that is, the great lakes in the north, and later refers to swamps, vast areas in the north and the Gobi Desert.

Source: Don Cen Can translated Snow White and Tian Shuji Wu Farewell Home.

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"The sand sea deepens the ice depth, the clouds are bleak, and Wan Li condenses." In two sentences, with exaggerated pen and ink, a magnificent snow scene was painted in Sasai, which arranged a typical farewell environment for Judge Wu's Return to Beijing. It is difficult to travel long distances in such cold and bad weather. The word "sadness" vaguely implies parting.