Savannakhét is a province of Laos located in the southern part of the country and is the largest province in Laos. It borders Khammouane Province to the north, Quảng Trị and Thừa Thiên–Huế provinces of Vietnam to the east, Salavan Province to the south, and Nakhon Phanom and Mukdahan provinces of Thailand to the west. The Second Thai–Lao Friendship Bridge over the Mekong connects Mukdahan Province in Thailand with Savannakhet in Laos. Its capital, Savannakhet, also known as Kaysone Phomvihane or Muang Khanthabouly is Laos' second most notable city after Vientiane.