The busiest Vietnam-Cambodia land gate, explained step by step for your visa run.
Moc Bai sits on Highway 22, about 80 kilometers northwest of Ho Chi Minh City, on the road to Phnom Penh. If your Vietnam tourist visa is running down, this is where a lot of people come to reset the clock.
The idea is simple. You ride out from your city in a van or private car, walk out of Vietnam, walk into Cambodia, and walk straight back in with a fresh stamp. The whole thing takes a day. Most people leave around 7 or 8 in the morning and are back home before dark.
Who uses Moc Bai? Mostly travelers based in Ho Chi Minh City, because it is only about a two hour drive. Nha Trang and Da Lat visa runs also use this crossing, though those trips are longer because the drive itself takes most of the morning. For comparison, the central cities like Da Nang, Hue, and Hoi An use the Lao Bao border with Laos, which works the same way in the other direction.
Why not just fly out and back? You can, and some people do. But a land crossing is cheaper, you do not need to book flights or pack a bag, and your passport never leaves your hand. You are in and out in under an hour at the border itself.
There is another reason Moc Bai matters right now. While you are at the border, your driver can file a fresh 90 day Vietnam e-visa application for you. It goes in the moment your exit stamp lands, and the approval arrives by email a few days later. That turns a boring border day into three more months in the country.
Moc Bai is on the main road from Ho Chi Minh City to Phnom Penh, so the route is easy even if it is not pretty. You drive northwest out of the city on Highway 22, past Cu Chi, and the border gate appears just after the town of Ben Cau.
You can drive yourself if you have a motorbike and the patience for Highway 22 traffic, but almost everyone books a van or private car through a visa run service. The van handles the paperwork rhythm, knows which window to queue at, and keeps your seat while you deal with stamps.
A shared van from HCMC runs around 1.5 to 2 million VND per person. A private car is more like 3 to 4 million VND for the whole group, which makes sense for two or three people traveling together.
One practical note: the border itself is a sprawl of gates, money changers, and snack stalls. It is not a tourist attraction. Pick a service that does this run every day, not someone figuring it out on the spot.
Here is what actually happens, in order. Knowing the sequence makes the whole thing feel less chaotic, because at first glance the border looks like a market with a passport booth in the middle.
Step 1: Exit Vietnam. Your van pulls up at the Vietnamese side. You walk into the departure hall with your passport and your current visa or e-visa. The officer stamps you out. That stamp ends your current stay, so make sure you are not overstaying before you arrive.
Step 2: Cross no-man's land. Between the two countries there is a short walkway lined with duty free shops and money changers. It takes about five minutes. This is also where people change leftover dong into dollars if they need cash for the Cambodia visa.
Step 3: Enter Cambodia. The Cambodian immigration hall is on the left as you arrive. You queue, hand over your passport, and either show an e-visa you already got online or apply for a visa on arrival at the counter.
Step 4: Get your Cambodia stamp. Visa on arrival takes about 15 to 30 minutes depending on the queue. You pay the fee, they glue the visa into your passport, and you walk through. You are now legally in Cambodia.
Step 5: Turn around. Here is the part that surprises first-timers. You do not need to go anywhere. You walk back through the same immigration point, get stamped out of Cambodia, cross back over the walkway, and re-enter Vietnam at the hall you started from.
Step 6: Fresh Vietnam entry stamp. At the Vietnamese window you present your passport again. If a 90 day e-visa application was filed for you during the run, the officer stamps you in on the new e-visa once it is approved, or you enter on a visa you arranged beforehand. Either way, the clock restarts.
Total time at the border itself is usually 45 minutes to an hour and a half. The long part of the day is the driving, not the stamping.
Money at Moc Bai moves in two currencies, and it pays to know which one each side wants.
Cambodia visa on arrival. The standard tourist visa costs USD 30 for a single entry, valid for 30 days. Cambodia runs on US dollars anyway, so bring USD 30 to 35 in cash. They will also take dong but at a worse rate, and card payments are not a thing at this window.
Cambodia e-visa. You can apply online at the official Cambodian e-visa site before you go. It costs about USD 36, takes up to three business days to approve, and saves you the counter queue. The tradeoff is planning: you need to apply before you leave, which defeats the purpose of a same-week emergency run.
Vietnam e-visa during the run. This is where the real value sits. A 90 day Vietnam e-visa costs about 2.4 million VND (roughly USD 95) and your visa run service files it online while you are at the border. Approval lands by email within 3 to 5 working days in most cases.
Transport. Shared van from HCMC is 1.5 to 2 million VND per person. Private car runs 3 to 4 million VND for the group. Nha Trang and Da Lat runs cost more because of the distance, usually 4 to 6 million VND per person for a van.
Add it up for a solo traveler from HCMC with a 90 day e-visa: roughly 4 million VND all in, or about USD 160, for three more months in Vietnam. Compared with a flight to Bangkok and back plus a hotel night, it is usually less than half the price.
A Moc Bai run is easy, but a few small mistakes turn it into a long day. These are the ones we see most often.
Check passport validity first. Vietnam and Cambodia both want at least six months left on your passport. If you are under that, the border officer can refuse the stamp and you will have wasted the whole drive.
Bring cash in both currencies. USD for the Cambodia fee, VND for snacks, water, and the odd "fast lane" helper. Do not rely on ATMs at the border. There are a couple, but they are not always working and the rates are poor.
Take a photo of your entry stamp. Snap your Vietnam entry stamp page on your phone before you leave. If there is ever a dispute about how many days you have left, that photo is your evidence.
Go in the morning. The border is calmest before 10 am. Afternoon runs mean bigger queues on the Cambodian side and a later return to the city.
Do not overstay, even by a day. The exit window checks your days before stamping. Overstayers get fined on the spot, and repeated overstays can trigger an exit ban. If your visa expires on a weekend or holiday, do the run the day before.
Expect a sales pitch, not a scam. Touts at the walkway sell sim cards, insurance, and "express service." The express service is usually just someone walking you to the front of a short queue. A polite no works fine. Keep your passport in your hand at all times.
Tell someone your plan. The drive from Nha Trang or Da Lat is long and the phone signal dies near the border zone. A quick message to a friend costs nothing.
About 6 to 8 hours door to door. Two hours out, under an hour at the border, a quick stop for lunch, two hours back. Nha Trang and Da Lat runs take the full day because of the driving.
Yes. Take a bus or drive to the border, walk through both gates, and come back. You save the service fee but you handle the queue, the paperwork rhythm, and the e-visa application yourself. If you do not speak Vietnamese, the visa run service removes most of the friction.
Yes. You are entering Cambodia, even for ten minutes, so you need either a visa on arrival or an e-visa. There is no turn-around exemption.
You cannot buy it at the border window. It is filed online by your visa run service while you are there, and it is approved by email a few days later. You exit on your old visa and re-enter on the new one once it lands.
New to the whole idea? Read what a Vietnam visa run is first, or see the full 2026 guide.