By road, Gualeguaychú and Cabo Polonio, Uruguay are about 378 miles (608 km) apart, or roughly 8 h 48 min of driving. You cross from Argentina into Uruguay at about mile 23, 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: “Gas stations are often far apart and not always easily identified from the main roadway.”
- Uruguay: “Traffic fatalities are high in Uruguay.”
| Total distance | 378 mi (608 km) |
|---|---|
| Time at the wheel, no stops | 8 h 48 min |
| Main roads, in order | RN136 → I-B |
| Border crossing | about mile 23, Argentina → Uruguay (the Gualeguaychú–Fray Bentos bridge) |
| Regions on the route | Entre Ríos, Río Negro, Soriano, Colonia, San José, Canelones, Maldonado, Rocha |
| Fuel estimate (car at 25 mpg) | about 15.1 gal; actual use varies by vehicle and traffic |
| Stops listed below | 9 |
Border crossing: what to bring for Uruguay
The route crosses at about mile 23, 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 Gualeguaychú to Cabo Polonio: the shape of the trip
RN136 (20 mi) and I-B (6 mi) carry about 7% of the 378 miles. The first 23 miles are in Argentina; the last 355 are in Uruguay. It runs through 8 regions: 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.
The route from Gualeguaychú to Cabo Polonio, road by road
| Road | Route miles (from–to) | Length, mi | Region |
|---|---|---|---|
| local roads | 0–1 | 1 | Entre Ríos |
| RN136 | 1–21 | 20 | Entre Ríos |
| connecting roads | 21–23 | 2 | Entre Ríos |
| local roads | 23–120 | 97 | Río Negro, Soriano |
| connecting roads | 120–121 | 1 | Soriano |
| local roads | 121–157 | 36 | Colonia, San José |
| connecting roads | 157–160 | 3 | San José |
| local roads | 160–256 | 96 | San José, Canelones, Maldonado |
| I-B | 256–262 | 6 | Maldonado |
| local roads | 262–378 | 116 | Maldonado, Rocha |
- Mile 23 of this route: Entre Ríos → Río Negro (international border)
- Mile 39 of this route: Río Negro → Soriano (region line)
- Mile 121 of this route: Soriano → Colonia (region line)
- Mile 138 of this route: Colonia → San José (region line)
- Mile 181 of this route: San José → Canelones (region line)
- Mile 251 of this route: Canelones → Maldonado (region line)
- Mile 308 of this route: Maldonado → Rocha (region line)
What to see on the way from Gualeguaychú to Cabo Polonio
- Right off the route (under 1 mile): Cathedral of San José de Mayo (mile 158), Teatro Politeama (mile 192), Observatorio Astronómico del CURE (mile 324), Teatro 25 de Mayo (mile 326)
- Nature and outdoors: Cerro Pan de Azúcar Native Wildlife Breeding Station (mile 262), Laguna José Ignacio (mile 296), La Sirena Beach (mile 367)
- Museums and history: Alejandro Berro Paleontology Museum (mile 38), Cathedral of San José de Mayo (mile 158), Iglesia de Cristo Obrero y Nuestra Señora de Lourdes (mile 228)
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 San José de Mayo
The main Catholic church of San José de Mayo, the Cathedral Basilica of St. Joseph has been the diocesan seat since 1955, a minor basilica since 1957 and Uruguay's national shrine of Saint Joseph.
Teatro Politeama
Canelones' Teatro Politeama opened in 1921 and reopened in 2014 as the Complejo Cultural Politeama Teatro Atahualpa del Cioppo. Uruguay declared the theater a National Historic Monument in 2022.
Iglesia de Cristo Obrero y Nuestra Señora de Lourdes
Engineer Eladio Dieste's Church of Christ the Worker in Estación Atlántida, inaugurated in 1960, joined UNESCO's World Heritage List in 2021. Look for its wavy brick walls and roof, an openwork brick bell tower and an underground baptistery.
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.
When you get to Cabo Polonio
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 Cabo Polonio
- Mercedes, Uruguay to Cabo Polonio
- Rivera to Cabo Polonio
- Paysandú to Cabo Polonio
- Salto to Cabo Polonio
- Bella Unión to Cabo Polonio
- Durazno to Cabo Polonio
More drives from Gualeguaychú
- Gualeguaychú to Adrogué
- Gualeguaychú to Berisso
- Gualeguaychú to Magdalena
- Gualeguaychú to Chascomús
- Gualeguaychú to Cariló
- Gualeguaychú to Villa Gesell
Frequently asked questions
How long is the drive from Gualeguaychú to Cabo Polonio, Uruguay?
About 8 h 48 min of driving without stops, over 378 miles.
How far is Cabo Polonio, Uruguay from Gualeguaychú by car?
About 378 miles (608 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 Gualeguaychú to Cabo Polonio drive cross the border?
At about mile 23, from Argentina into Uruguay, at the Gualeguaychú–Fray Bentos bridge.
What do U.S. citizens need to drive from Gualeguaychú 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 Gualeguaychú to Cabo Polonio 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.
What roads does the drive from Gualeguaychú to Cabo Polonio use?
In order: 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 Gualeguaychú to Cabo Polonio?
Closest to the road: Cathedral of San José de Mayo (cathedral, mile 158, 0.9 mi from the route); Teatro Politeama (theater, mile 192, 0.2 mi from the route); Observatorio Astronómico del CURE (astronomical observatory, mile 324, 0.3 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.