Shenzhen has land, sea, air and rail ports. There are nine wharfs, such as Shekou wharf, Fuyong wharf and Yantian wharf, in Shenzhen and the city has six railway stations, including Shenzhen Railway Station, Shenzhen North Railway Station and Shenzhen East Railway Station. The Guangzhou-Shenzhen-Hong Kong Express Rail Link, an important rail link in the country, runs across Shenzhen. Shenzhen International Airport is a regional pivot airport and the fourth-largest airport in China. As one of the top 100 airports in the world, Shenzhen Airport has so far launched 46 international flights and four flights to Hong Kong, Macao and Taiwan.