| Name | Viitna F-11 puurauk (phosphorite) |
| Number | F-11 |
| Type | borehole (section) |
| Country | Estonia |
| Parish | Kadrina |
| Settlement | Viitna |
| Coordinates | null, null |
| Remarks | fosforiidiaugud, originaaltähistuses ladina F erinevalt vundamendi kirillitsa F-ist |
| Date added | 2003-05-20 |
| Date changed | 2009-02-03 |
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