Adress: 6 Giai Phong, Ha Noi
A busy and rather chaotic bus station, Giap Bat is the main gateway of Hanoi to Center and Southern provinces. There are frequent buses to Haiphong (every half hour), Nam Dinh (every half hour), Nghe An (every hour until 11:00), Ninh Binh (every hour until 11:50), Ho Chi Minh City (10:00; 13:00; 15:00; 18:00; 8:00).
Make sure that you walk straight to the main building to buy ticket and avoid following any driver who convinces you to get on his vehicle. The ticket price from Hanoi to Haiphong is about $2 and $6 to Nghe an. Buses that head Ho Chi Minh City often have double decker or larger couch and so the tickets might be more expensive ($20-40).