China's peak travel season has officially kicked off. Every year, Spring Festival sees the largest annual mass migration on the planet. Over the coming days, hundreds of millions of Chinese people will return home to reunite with their families. This year, the Ministry of Transport has forecast that 2.98 billion trips will be taken during the 40-day travel rush, 2.2 percent more than last year. Although Chinese railway speeds have increased significantly and high-speed trains have joined the holiday transport rush, it is still not an easy journey home for many. Since 2005, photographer Wu Fang has captured the biggest movement of people on Earth with her lens, recording travelers' herculean efforts to return home for the festival.