Plan on about 10 h 51 min of driving for the 498-mile (801 km) trip from Luján to Barra de Valizas, Uruguay, before any stops. You cross from Argentina into Uruguay at about mile 147, at the Gualeguaychú–Fray Bentos bridge.
Full advisory: Argentina, Uruguay. Advisory issued: Argentina July 10, 2026; Uruguay July 28, 2026; checked October 10, 2026.
On the roads, the State Department says:
- Argentina: “Drivers in Argentina tend to be aggressive, especially in Buenos Aires, and often ignore traffic regulations.”
- Uruguay: “If you are in an accident involving injury, stay in place until a police officer arrives.”
| Total distance | 498 mi (801 km) |
|---|---|
| Drive time without stops | 10 h 51 min |
| Main roads, in order | RP47 → RP6 → RN12 → RN14 → RN136 → I-B |
| Border crossing | about mile 147, Argentina → Uruguay (the Gualeguaychú–Fray Bentos bridge) |
| Regions on the route | Buenos Aires, Entre Ríos, Río Negro, Soriano, Colonia, San José, Canelones, Maldonado, Rocha |
| Fuel estimate (car at 25 mpg) | about 19.9 gal; actual use varies by vehicle and traffic |
| Stops listed below | 9 |
The border on the way to Barra de Valizas
The route crosses at about mile 147, at the Gualeguaychú–Fray Bentos bridge, from Entre Ríos into Río Negro. Plan on two checks on each side: immigration for your passport and customs for the car.
| Entering Uruguay (U.S. citizens) | No visa needed for visits of 90 days or less. Passport: must be valid for 6 months beyond your arrival date. |
|---|---|
| Driving in Uruguay | You can drive on your U.S. license. |
| Entering Argentina (U.S. citizens) | No visa needed for visits of 90 days or less. Passport: must be valid when you enter; leave a blank page for the entry and exit stamps. |
| Driving in Argentina | A valid U.S. license usually works; an International Driving Permit is recommended. |
| Rental car | Cross only if the rental company authorizes it in writing and gives you the papers for the border; ask before you book. |
Sources: U.S. State Department, Uruguay (updated August 13, 2026); U.S. State Department, Argentina (updated July 16, 2026). Checked October 10, 2026; rules change, so confirm before you go.
Driving Luján to Barra de Valizas: the shape of the trip
RN12 (47 mi) and RN14 (37 mi) carry about 17% of the 498 miles. The first 147 miles are in Argentina; the last 351 are in Uruguay. It runs through 9 regions: Buenos Aires, Entre Ríos, Río Negro, Soriano, Colonia, San José, Canelones, Maldonado, Rocha. Of the 9 stops listed below, 4 are within a mile of the road.
Road-by-road breakdown: Luján to Barra de Valizas
| Road | Route miles (from–to) | Length, mi | Region |
|---|---|---|---|
| local roads | 0–1 | 1 | Buenos Aires |
| RP47 | 1–7 | 6 | Buenos Aires |
| connecting roads | 7–8 | 1 | Buenos Aires |
| RP6 | 8–35 | 27 | Buenos Aires |
| RN12 | 35–82 | 47 | Buenos Aires, Entre Ríos |
| RN14 | 82–119 | 37 | Entre Ríos |
| local roads | 119–126 | 7 | Entre Ríos |
| RN136 | 126–145 | 19 | Entre Ríos |
| connecting roads | 145–147 | 2 | Entre Ríos |
| local roads | 147–244 | 97 | Río Negro, Soriano |
| connecting roads | 244–245 | 1 | Soriano |
| local roads | 245–281 | 36 | Colonia, San José |
| connecting roads | 281–284 | 3 | San José |
| local roads | 284–351 | 67 | San José, Canelones |
| connecting roads | 351–352 | 1 | Canelones |
| local roads | 352–380 | 28 | Canelones, Maldonado |
| I-B | 380–386 | 6 | Maldonado |
| local roads | 386–498 | 112 | Maldonado, Rocha |
- Mile 53 of this route: Buenos Aires → Entre Ríos (region line)
- Mile 147 of this route: Entre Ríos → Río Negro (international border)
- Mile 163 of this route: Río Negro → Soriano (region line)
- Mile 245 of this route: Soriano → Colonia (region line)
- Mile 262 of this route: Colonia → San José (region line)
- Mile 306 of this route: San José → Canelones (region line)
- Mile 375 of this route: Canelones → Maldonado (region line)
- Mile 432 of this route: Maldonado → Rocha (region line)
Breaking up the drive: stops between Luján and Barra de Valizas
- Right off the route (under 1 mile): Cathedral of Mercedes (mile 165), Cathedral of Our Lady of Guadalupe (mile 316), Observatorio Astronómico del CURE (mile 448), Teatro 25 de Mayo (mile 450)
- Nature and outdoors: Ciervo de los Pantanos National Park (mile 26), Cerro Pan de Azúcar Native Wildlife Breeding Station (mile 386), Laguna José Ignacio (mile 421), La Sirena Beach (mile 492)
- Museums and history: Cathedral of Mercedes (mile 165), Cathedral of Our Lady of Guadalupe (mile 316), Iglesia de Cristo Obrero y Nuestra Señora de Lourdes (mile 352)
Ciervo de los Pantanos National Park
Ciervo de los Pantanos National Park (Parque Nacional Ciervo de los Pantanos) protects about 2,500 hectares of wetlands in Campana, Buenos Aires province, home to the marsh deer that gives it its name and to abundant waterbirds. It is a Ramsar Site.
Cathedral of Mercedes
Since 1960, the Diocese of Mercedes has had its seat at the Cathedral of Our Lady of Mercy, the main Catholic church in this Uruguayan city.
Cathedral of Our Lady of Guadalupe
Construction of Canelones' Cathedral of Our Lady of Guadalupe began in 1816; the church became a cathedral in 1961 and Uruguay's national shrine of Our Lady of Guadalupe in 2020.
Iglesia de Cristo Obrero y Nuestra Señora de Lourdes
Wavy brick walls and a rippling brick roof define this church in Estación Atlántida, along with an openwork brick bell tower and a baptistery set underground. Engineer Eladio Dieste designed it, and it opened in 1960.
Cerro Pan de Azúcar Native Wildlife Breeding Station
Near Piriápolis in Maldonado, this breeding station for native wildlife on Cerro Pan de Azúcar is surrounded by native vegetation and offers guided visits, including a native wildlife trail and a path up the hill.
Laguna José Ignacio
In Uruguay's Maldonado Department, Laguna José Ignacio is a coastal lagoon kept apart from the Atlantic Ocean by a sandbank.
Observatorio Astronómico del CURE
Run by the University of the Republic's eastern campus (CURE), this small observatory in Rocha opened in 2016 and uses a 30 cm reflector telescope under a motorized dome for teaching, research and public outreach.
Teatro 25 de Mayo
Rocha's Teatro 25 de Mayo opened in 1910 as an Italian-style theater in the eclectic style, with room for about 400 people. Now a cultural complex, it is a stop on the city's self-guided heritage walk.
La Sirena Beach
About 2.5 km north of Aguas Dulces, La Sirena is one of Uruguay's two official naturist beaches, backed by vegetated dunes, small marshes, lagoons and pine and acacia woods where coastal birds are common.
In Barra de Valizas itself
Parque nacional Cabo Polonio
Part of Uruguay's national protected areas system since 2009, Cabo Polonio National Park spans 25,820 hectares of coastline, ocean and offshore islands.
Cabo Polonio Lighthouse
Standing on the Cabo Polonio headland in Uruguay's Rocha department, this lighthouse looks out over the Atlantic Ocean and was built in 1881.
Dunes of Cabo Polonio
Inside Cabo Polonio National Park in Uruguay's Rocha department, a band of natural sand dunes runs along the Atlantic Ocean.
More drives to Barra de Valizas
- Maldonado to Barra de Valizas
- Montevideo to Barra de Valizas
- Veinticinco de Agosto to Barra de Valizas
- Nueva Helvecia to Barra de Valizas
- Colonia del Sacramento to Barra de Valizas
- Conchillas to Barra de Valizas
More drives from Luján
- Luján to Adrogué
- Luján to Berisso
- Luján to Magdalena
- Luján to Capilla del Monte
- Luján to Villa Carlos Paz
- Luján to Tacuarembó, Uruguay
Frequently asked questions
How long is the drive from Luján to Barra de Valizas, Uruguay?
About 10 h 51 min of driving without stops, over 498 miles.
How far is Barra de Valizas, Uruguay from Luján by car?
About 498 miles (801 km) on the Wayro route. Other map services may show a few miles more or less, depending on where they start and end in each city.
Where does the Luján to Barra de Valizas drive cross the border?
At about mile 147, from Argentina into Uruguay, at the Gualeguaychú–Fray Bentos bridge.
What do U.S. citizens need to drive from Luján into Uruguay?
No visa needed for visits of 90 days or less. Passport: must be valid for 6 months beyond your arrival date. You can drive on your U.S. license. (U.S. State Department, updated August 13, 2026.)
What does the U.S. travel advisory say about the Luján to Barra de Valizas drive?
The U.S. State Department rates Argentina Level 1: Exercise Normal Precautions; Uruguay Level 2: Exercise Increased Caution. Read the full advisory before you go.
Which highways go from Luján to Barra de Valizas?
In order: RP47, RP6, RN12, RN14, RN136 and I-B. The road-by-road table above shows the route miles for each one.
Where can you stop on the way from Luján to Barra de Valizas?
Closest to the road: Cathedral of Mercedes (cathedral, mile 165, 0.7 mi from the route); Cathedral of Our Lady of Guadalupe (cathedral, mile 316, 0.2 mi from the route); Observatorio Astronómico del CURE (astronomical observatory, mile 448, 0.4 mi from the route). All stops are described above.
How we put this guide together
Wayro calculates the route from OpenStreetMap road data; mile numbers are positions along this route, not highway markers, and "from the route" distances are straight-line, so the real detour depends on access roads. Stops are chosen from parks, natural sites, museums, historic sites and attractions close to the route: at least one strong stop for each stretch of the drive, then the best-known places nearest the road, up to nine in all. Places that are closed, private or not open to visitors are removed. Place descriptions are written by the Wayro team from official park, museum, tourism and government websites and other published sources. Safety levels and entry rules were checked against the U.S. Department of State on October 10, 2026. Conditions change, so check the linked sources before you travel.
Route data © OpenStreetMap contributors.