Santo Tomé, Argentina

Santo Tomé sits on the Uruguay River, staring down São Borja across the water in Brazil. The reddish soil and subtropical climate mean sticky summers that hit 40°C, with rains peaking in April and October. This isn't a polished expat hub—it's a working Argentine river town where you'll need decent Spanish and tolerance for bureaucratic tangles with cross-border errands.

The riverfront location gives easy access to Brazil, but infrastructure lags. High rainfall turns some lowland streets into swamps seasonally. Retirees here trade big-city amenities for quiet, cheap living—if they can handle the heat and occasional border-town hassles.