| Name | Viljandi 91 borehole |
| Number | 91 |
| Type | borehole (section) |
| Country | Estonia |
| Parish | Pärsti |
| Settlement | Sinialliku |
| Elevation | 53.20 |
| Coordinates | 58.311766, 25.587023 |
| X | 6464559 |
| Y | 593015 |
| Coord. agent | Eesti Geoloogiakeskus (EGK) |
| Location remarks | Viljandi järve lõunaotsast veel ca 2,5 km lõuna pool ja ca 1 km Riia mnt-st ida pool (Viljandi linna piires) |
| Strat. top | Narva Stage |
| Strat. base | Proterozoic |
| Remarks | Puuritud 1967; K. Kajak kaardistamine. Südamikku säilitatakse Keilas. Kristalse aluskorra pealispind 494,4 m; EGF 2978 |
| Estonian Land Board ID | 1842 |
| Date changed | 2022-11-21 |
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