Cucao and Huillinco
      | Cucao and Huillicno Lake Lago Cucao y Huillinco
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| View of Cucao Lake | 
| Primary outflows | Cucao River, also called Desaguadero River | 
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| Basin countries | Chile | 
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| Surface area | 43.8 km² | 
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Cucao and Huillinco are two lakes in central Chiloé Island, Chile, linked by a strait forming one hydrologic lake. The two lakes are orinted in west-east fashion cutting of the Chilean Coast Range in Chiloé Island into two ranges; Piuchén to north and Pirulil to the south. The outlet of the lakes, Desaguadero or Cucao River lies at Cucao Lakes western end, and flows into the Pacific.
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