📍Getting there. 6–7 hr by road from Hanoi (overnight bus or private transfer).
⛰️Terrain. Big karst passes, switchbacks and remote frontier roads.
🌤️Climate. Northern monsoon — dry, cool winters; wet, slip-prone Jun–Aug.
💶Currency & language. Vietnamese đồng (₫) · Vietnamese
💡Local tip. Avoid Jun–Aug — monsoon rain and landslides hit the loop.
