In addition to the international airports in Vientiane, Luang Prabang, and Pakse, there are numerous land and river crossings into Laos. The busiest is the Friendship Bridge, which spans the Mekong River 29 km (12 miles) east of Vientiane. Other border crossings from Thailand to Laos are: Chiang Khong to Huay Xai (by ferry across the Mekong River); Nakhon Phanom to Tha Khek; Mukdahan to Savannakhet; and Chongmek to Vang Tao. You can also enter Laos from Cambodia at Voeung Kam; and from Mohan, in China's Yunnan Province, at Boten.
Border crossings are open daily 8:30 to 5, except for the Friendship Bridge, which is open daily 6 to 10.