Swans swim in the Qinghai Lake in northwest China's Qinghai Province, Nov. 27, 2012. The Qinghai Lake, China's largest inland saltwater lake, has expanded for eight years in a row to 4,402.5 square km. [Xinhua]

Swans swim in the Qinghai Lake in northwest China's Qinghai Province, Nov. 27, 2012. The Qinghai Lake, China's largest inland saltwater lake, has expanded for eight years in a row to 4,402.5 square km. [Xinhua]

Swans swim in the Qinghai Lake in northwest China's Qinghai Province, Nov. 27, 2012. The Qinghai Lake, China's largest inland saltwater lake, has expanded for eight years in a row to 4,402.5 square km. [Xinhua]

Swans swim in the Qinghai Lake in northwest China's Qinghai Province, Nov. 27, 2012. The Qinghai Lake, China's largest inland saltwater lake, has expanded for eight years in a row to 4,402.5 square km. [Xinhua]

Swans swim in the Qinghai Lake in northwest China's Qinghai Province, Nov. 27, 2012. The Qinghai Lake, China's largest inland saltwater lake, has expanded for eight years in a row to 4,402.5 square km. [Xinhua]

Swans swim in the Qinghai Lake in northwest China's Qinghai Province, Nov. 27, 2012. The Qinghai Lake, China's largest inland saltwater lake, has expanded for eight years in a row to 4,402.5 square km. [Xinhua]

Swans swim in the Qinghai Lake in northwest China's Qinghai Province, Nov. 27, 2012. The Qinghai Lake, China's largest inland saltwater lake, has expanded for eight years in a row to 4,402.5 square km. [Xinhua]

Swans swim in the Qinghai Lake in northwest China's Qinghai Province, Nov. 27, 2012. The Qinghai Lake, China's largest inland saltwater lake, has expanded for eight years in a row to 4,402.5 square km. [Xinhua]

Swans swim in the Qinghai Lake in northwest China's Qinghai Province, Nov. 27, 2012. The Qinghai Lake, China's largest inland saltwater lake, has expanded for eight years in a row to 4,402.5 square km. [Xinhua]