| Feature Name: | Sylvan Lake
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| Feature Type: | reservoir
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| State: | South Dakota
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| County: | Custer
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| County Population: | 7275
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| County Housing Units: | 3624
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| County Size: | 1557.69 Square Miles
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| Latitude: | 43.8475
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| Longitude: | -103.56528
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| Elevation: | 6145
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| Map Cell Name: | Custer
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| Geographic Keywords: | Sylvan
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