Region

Mesopotamia

Go for Iguazú Falls plus one wetland or mission stop; 5–7 nights, flying between stops, not one long bus.

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Key facts · Argentina

Visa: Depends on your passport
Currency: Argentine peso (ARS, $)
Language: Spanish
Plugs: I · C · 220 V
Time zone: UTC−3 all year

Month by month hereIn detail ↓

Rules in force · 7Above 2,500 m (Bogotá, Quito, Cusco, La Paz) keep the fir…

South America ↗Above 2,500 m (Bogotá, Quito, Cusco, La Paz) keep the first day light; sleep lower where you can (Sacred Valley before Cusco) and descend if headache comes with vomiting or confusion.
South America ↗A yellow fever certificate is required on arrival in French Guiana, and asked for on some routes into Bolivia, Paraguay, Suriname and Guyana, or when arriving from Amazon areas — vaccinate at least 10 days before travel and carry the card.
South America ↗Overnight buses are the norm in Argentina, Chile and Peru, but pick top-tier companies and keep valuables on your body; on-board thefts from overhead racks are the common loss.
Argentina ↗Check entry rules for your passport with Argentina's National Migration Directorate (Migraciones) or an Argentine consulate before booking.
Argentina ↗Since April 2025 the official, MEP and street ('blue') dollar rates sit within a few percent of each other; a foreign card is usually the best-value way to pay, while ATM withdrawals carry high fixed fees. Rules have changed often — check before you fly.
Argentina ↗Patagonia (El Calafate, El Chaltén, Ushuaia) is a November–March trip; in winter many services close and hiking is limited.
Argentina ↗Since August 2026 non-resident foreigners must show insurance or pay for non-urgent care at nationally run public hospitals, and Buenos Aires City, Mendoza, Salta, Jujuy and Santa Cruz charge visitors for scheduled care; emergencies are still treated. Travel with medical insurance — check the current rules.

Mesopotamia is the green northeast between the Paraná and Uruguay rivers: Misiones holds Iguazú Falls and the Jesuit mission ruins, Corrientes holds the Esteros del Iberá wetlands, and Entre Ríos holds hot springs and river towns. Distances are long and buses are slow, so pick one or two bases and fly the long legs. Two nights at Iguazú is the core; add two or three nights at Iberá if you want wildlife.

Where to sleep

3 places in this region

Sleep base

Puerto IguazúCity guide
Gateway to the Argentine side of the falls; airport nearby.
Best Apr–May, Aug–Sep
JFMAMJJASOND
Open Puerto Iguazú →

Also here

PosadasCity guide
Provincial capital on the Paraná; base for San Ignacio Miní.
Best Apr–Oct
JFMAMJJASOND
Open Posadas →
CorrientesRegion
Access to Esteros del Iberá via Mercedes or Concepción.
Open Corrientes →

Plan the nights

How to split the nights, day-trips and what to do with your bags

Open Plan the nightsClose Plan the nights3 partsNights · Day-trips · Bags

Night sequences

5 nights: Puerto Iguazú 2 + Posadas/San Ignacio 1 + Iberá 2
7 nights: Puerto Iguazú 3 + Iberá 3 + one night in Corrientes or Posadas

Buenos Aires to Puerto Iguazú is about 18 hours by bus; fly instead unless you want the overnight ride.
Iberá gravel roads can be impassable after heavy rain; check conditions before booking a tour.
Summer (Dec–Feb) is hot and humid with heavy rain; mosquitoes are constant near the wetlands.

Day-trips door to door

To	From	Door-to-door p50	Last return	Note
Iguazú Falls, Argentine side	Puerto Iguazú	30 min	unknown	Park entrance is a short bus or taxi ride from town; go at opening to beat tour groups.
San Ignacio Miní	Posadas	60 min	unknown	Jesuit mission ruins about an hour from Posadas; combine with a stop en route to Iguazú.

Bags between cities

Luggage storage is common at Puerto Iguazú hotels; there is no practical same-day luggage forwarding between Mesopotamia towns — travel with your bags.

When to go

Months and weather

Open When to goClose When to go2 partsSeasons · Climate

Seasons at a glance

From each city's month table

Pick a month to see where to go.

Only good-now countries

Show all 12 months, country by countryHide the 12-month table

Country	JJan	FFeb	MMar	AApr	MMay	JJun	JJul	AAug	SSep	OOct	NNov	DDec
Puerto Iguazú	×	×	ok	go	go	ok	ok	go	go	ok	ok	ok
Posadas	×	×	ok	go	go	go	go	go	go	go	ok	×
Argentina (country-wide)	ok	go	go	go	ok	ok	ok	ok	go	go	go	go

Go: the good monthsFair: workable, mixedPoor: heat, rain or hazeAvoid: storms, floods, closuresno data yet

Computed from each country’s own data; hover a country name for the source. Advisory countries are left out.

Climate strip

Month by month

Zone	J	F	M	A	M	J	J	A	S	O	N	D
Misiones and CorrientesSubtropical northeast	hot	hot	hot	ok	ok	ok	ok	ok	ok	ok	hot	hot

ok: workablehot: short walking windows

Misiones and Corrientes: Warm and humid most of the year; rain is possible in any month, heaviest in summer. Winter (Jun–Aug) is milder and drier — good for walking the falls.

Iguazú Falls runs year-round; water volume is highest in the wet season. Iberá wildlife viewing is often best in the drier, cooler months.

Getting in and passes

Arrival times and regional passes

Open Getting in and passesClose Getting in and passes1 partGet in

Get in

Door-to-door p50, 2026 estimate

From	To	How	p50	Note
Buenos Aires (AEP/EZE)	Puerto Iguazú (IGR)	Direct flight	~2 h	Aerolíneas Argentinas and Flybondi serve the route; check schedules and fares for 2026.
Buenos Aires (AEP/EZE)	Corrientes (CNQ) or Posadas (PSS)	Direct flight	~1 h 40	Both have airports with flights to Buenos Aires; onward travel to Iberá or Iguazú is by road.
Buenos Aires	Posadas / Corrientes / Puerto Iguazú	Long-distance bus	12–18 h	Frequent connections; overnight buses are the budget option but eat a full day.

Eat and move on

Regional food and where to go next

Open Eat and move onClose Eat and move on2 partsFood · Go next

Regional food

Where and when it works

Dish	Where	Timing / trap
Chipa and mate	Misiones and Corrientes	Chipa (cheese cassava bread) is sold at bus stops and bakeries; mate is drunk everywhere.
River fish (surubí, dorado)	Paraná and Uruguay river towns	Grilled or in stews; look for it on menus in Corrientes and Posadas.
Asado and empanadas	Region-wide	Empanadas vary by province; Corrientes and Misiones have their own fillings.

Go next

Patagonia

Fly Buenos Aires to El Calafate or Bariloche

A separate trip; connect via Buenos Aires.

Andean Northwest

planned

Fly via Buenos Aires or Salta

Canyons and colonial towns; different climate and landscape.

Chaco

planned

Road from Corrientes or Resistencia

Dry forest west of Mesopotamia; less visited.

Cuyo

planned

Fly via Buenos Aires to Mendoza

Wine and Andes; a long way from the northeast.

Pampas

planned

Bus or drive south from Entre Ríos

Grassland and Buenos Aires province.

Planning aids

Built from this guide's own data

Open Planning aidsClose Planning aids2 partsIn numbers · Going in…

Region in numbers

Where to sleep: 1 base
Day trips: 2, 30 min to 1 h
Nights suggested: 5–7 nights
Ways in: 3 listed
Best months: No month rated best

Going in…

Pick a month for the weather in each zone of the region, plus the country-wide rating and holidays.

Pick a month.

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Deep dive

Photos, reading and every source

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Sources

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