| Ventana system | |
|---|---|
| Sistema de Ventania | |
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| Highest point | |
| Peak | Cerro Tres Picos, near Tornquist |
| Elevation | 1,239 m (4,065 ft) |
| Coordinates | 38°9′20″S 61°57′0″W / 38.15556°S 61.95000°W |
| Dimensions | |
| Length | 195 km (121 mi) NW to SE |
| Naming | |
| Native name | Sistema de las Sierras de Ventania (Spanish) |
| Geography | |
 | |
| Country | Argentina |
| Province | Buenos Aires Province |
| Settlements | Pigüé, Puan and Tornquist |
The Sierra de la Ventana (also Sierras de Ventania) is a mountain range in Buenos Aires Province, and one of only two located within the Pampas ecosystem.