River transportation is available with easy access to the Yellow River, Huaihe, Weihe and Hanshui Rivers, all of which run through the province. Zhengzhou, the provincial capital, is one of the most important railway transportation hubs in China and Asia itself. The railways are the main means of transport. Three trunk lines cross the province. Henan has airports in Zhengzhou, Luoyang and Nanyang and international flight services are available from Zhengzhou. All the towns and cities in the province are linked by highways.