Guy’s thin maturity was changing in her vision to flushed youth and they were roaming an island in the yellow sea of chatter when she realized that the guests were beginning that cough which indicated, in the universal instinctive language, that they desired to go home and go to bed.
There are no more uses of "Yellow Sea" in the book.
Show samples from other sources
Just an orange-yellow sea of dust and rocks; wavering currents of heated air boiled on the horizon like steam, floating upward, as if any life out there were melting toward the cloudless and pale blue sky.
James Dashner -- The Scorch Trials
As morning mowers, who side by side slowly and seethingly advance their scythes through the long wet grass of marshy meads; even so these monsters swam, making a strange, grassy, cutting sound; and leaving behind them endless swaths of blue upon the yellow sea.