阅读下列短文，从每题所给的四个选项（A、B、C、D）中，选出最佳选项。
More and more birds are flying to settle at Qinghai Lake, one of the highest inland lakes in China, thanks to the protection efforts of local governments. Covering an area of over 4,000 square kilometers. Qinghai Lake is also the country's biggest saltwater lake.
Located in Northwest China's Qinghai Province, the lake is famous for the two islands at its northwest point—Cormorant Island and Egg Island.
