The major border crossing between Laos and Vietnam is Lao Bao connecting the Centre of Vietnam and Savannakhet Province of Laos. You will need a Laos visa and a re-entry Vietnamese visa if you go back to Vietnam. Tourist buses Savannakhet - Hue leave daily at 10pm, serving Dong Ha (US$7 per person, 329km), Hue (US$9 per person, 409km) or Danang (US$11 per person, 508km). Approaching in the other direction, buses at Hue depart at 6am or 6pm daily, cost US$15 per person and take thirteen hours. Check the Savannakhet or Hue travel agencies for best prices.Otherwise, catch local buses from Savannakhet (US$3 per person, 255km, 5 hours, leave at 7am and noon) or Sawngthaew (pick-up truck - US$3 per person, 210km, 4 hours, leave regularly) to Sepon, accommodate there and hit the morning bus to the border. Across the border on foot, next carry on 20-minute walking or take xe om (renting motorbike with driver - VND10,000 per person) to Lao Bao Bus station for departing Hue or Danang.