Tandil to Conchillas, Uruguay is about 469 road miles (755 km): roughly 9 h 49 min at the wheel if you don't stop. You cross from Argentina into Uruguay at about mile 363, 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: “Illumination, pavement markings, and road surfaces for secondary roads can be poor.”
| Distance by road | 469 mi (755 km) |
|---|---|
| Drive time without stops | 9 h 49 min |
| Main roads, in order | RP30 → RN3 → RP6 → RN12 → RN14 → RN136 |
| Border crossing | about mile 363, Argentina → Uruguay (the Gualeguaychú–Fray Bentos bridge) |
| Regions on the route | Buenos Aires, Entre Ríos, Río Negro, Soriano, Colonia |
| Fuel estimate (car at 25 mpg) | about 18.8 gal; actual use varies by vehicle and traffic |
| Stops listed below | 9 |
The border on the way to Conchillas
The route crosses at about mile 363, 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 Tandil to Conchillas: the shape of the trip
RP30 (93 mi) and RN3 (80 mi) carry about 37% of the 469 miles. The first 363 miles are in Argentina; the last 106 are in Uruguay. It runs through 5 regions: Buenos Aires, Entre Ríos, Río Negro, Soriano, Colonia. Of the 9 stops listed below, 2 are within a mile of the road.
Road-by-road breakdown: Tandil to Conchillas
| Road | Route miles (from–to) | Length, mi | Region |
|---|---|---|---|
| local roads | 0–4 | 4 | Buenos Aires |
| connecting roads | 4–5 | 1 | Buenos Aires |
| RP30 | 5–98 | 93 | Buenos Aires |
| RN3 | 98–178 | 80 | Buenos Aires |
| RP6 | 178–250 | 72 | Buenos Aires |
| RN12 | 250–298 | 48 | Buenos Aires, Entre Ríos |
| RN14 | 298–334 | 36 | Entre Ríos |
| local roads | 334–341 | 7 | Entre Ríos |
| RN136 | 341–360 | 19 | Entre Ríos |
| connecting roads | 360–363 | 3 | Entre Ríos |
| local roads | 363–382 | 19 | Río Negro, Soriano |
| connecting roads | 382–383 | 1 | Soriano |
| local roads | 383–469 | 86 | Soriano, Colonia |
- Mile 268 of this route: Buenos Aires → Entre Ríos (region line)
- Mile 363 of this route: Entre Ríos → Río Negro (international border)
- Mile 378 of this route: Río Negro → Soriano (region line)
- Mile 433 of this route: Soriano → Colonia (region line)
Stops between Tandil and Conchillas
- Right off the route (under 1 mile): Cathedral of Mercedes (mile 380), Museo Municipal Profesor Roselli (mile 432)
- Nature and outdoors: Reserva natural Guardia del Juncal (mile 165), Ciervo de los Pantanos National Park (mile 242), Agraciada Beach (mile 429)
- Museums and history: Alejandro Berro Paleontology Museum (mile 377), Cathedral of Mercedes (mile 380), Museo Municipal Profesor Roselli (mile 432), Museo del Carmen (mile 447)
Reserva natural Guardia del Juncal
Guardia del Juncal nature reserve in Cañuelas covers 137 hectares, including a historic estate, the Guardia del Juncal Museum and a natural area; it became a provincial reserve in 2006.
Ciervo de los Pantanos National Park
Marsh deer give their name to Ciervo de los Pantanos National Park, a Ramsar Site in Campana, Buenos Aires province, where waterbirds are abundant.
Frigorífico Anglo del Uruguay
Liebig exported meat extract and corned beef from this spot on the Uruguay River at Fray Bentos starting in 1865. In 1924, the Anglo plant began shipping frozen meat from the same site.
Alejandro Berro Paleontology Museum
In a 19th-century building in Mercedes' Parque Castillo Mauá, this paleontology museum opened in 1946 around the collection of naturalist Alejandro Berro; a well-preserved glyptodon shell found on a nearby riverbank is a highlight.
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.
Agraciada Beach
On the eastern bank of the Uruguay River in Soriano department, Agraciada Beach is a historic beach area facing Argentina's Entre Ríos province.
Museo Municipal Profesor Roselli
Nueva Palmira's municipal museum, also known as the Museo Roselli, is named for its first director, Professor Francisco Lucas Rosselli.
Teatro Uamá
Teatro Uamá is a theater in the city of Carmelo, in Uruguay's Colonia department, regarded as the town's leading cultural institution.
Museo del Carmen
Facing Plaza Artigas in Carmelo, the Archivo y Museo del Carmen belongs to the local Carmelo parish and holds religious and historical collections.
More drives to Conchillas
- Tacuarembó to Conchillas
- Artigas to Conchillas
- Veinticinco de Agosto to Conchillas
- Fray Marcos to Conchillas
- Minas to Conchillas
- Alejandro Gallinal to Conchillas
More drives from Tandil
- Tandil to Tigre
- Tandil to Salto, Uruguay
- Tandil to Tacuarembó, Uruguay
- Tandil to Mercedes, Uruguay
- Tandil to Florida, Uruguay
- Tandil to Colonia del Sacramento, Uruguay
Frequently asked questions
How long is the drive from Tandil to Conchillas, Uruguay?
About 9 h 49 min of driving without stops, over 469 miles.
What is the driving distance from Tandil to Conchillas, Uruguay?
About 469 miles (755 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 Tandil to Conchillas drive cross the border?
At about mile 363, from Argentina into Uruguay, at the Gualeguaychú–Fray Bentos bridge.
What do U.S. citizens need to drive from Tandil 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.)
Is it safe to drive from Tandil to Conchillas, Uruguay?
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.
What roads does the drive from Tandil to Conchillas use?
In order: RP30, RN3, RP6, RN12, RN14 and RN136. The road-by-road table above shows the route miles for each one.
Where can you stop on the way from Tandil to Conchillas?
Closest to the road: Cathedral of Mercedes (cathedral, mile 380, 0.7 mi from the route); Museo Municipal Profesor Roselli (museum, mile 432, 0.7 mi from the route); Teatro Uamá (theater, mile 447, 1 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.