Every winter, hundreds of millions of Chinese return home for the Spring Festival, the Chinese celebration of the Lunar New Year (which this year lands on January 31).

The mass migration, known in Chinese as chunyun, is on track to reach an unprecedented scale in 2014. According to Lian Weiliang, the deputy head of China's National Development and Reform Commission, an estimated 3.62 billion trips will be made during the 40-day period surrounding the holiday, an increase of roughly 5.8 percent, or 200 million trips, compared with 2013.

Simply put, it is the largest annual human migration in the world.

Baidu, China's dominant search engine, has now made it possible to visualize this tremendous pilgrimage, unveiling a map that displays Spring