| Name | Illuka 81 K-5 borehole |
| Number | 81 K-5 |
| Type | borehole (section) |
| Country | Estonia |
| Parish | Illuka |
| Settlement | Ongassaare |
| Elevation | 54.00 |
| Coordinates | 59.190668, 27.464114 |
| X | 6566466 |
| Y | 697906 |
| Coord. agent | Eesti Geoloogiakeskus (EGK) |
| Strat. top | Nabala Stage |
| Strat. base | Proterozoic |
| Remarks | Puuritud suuremõõdulisel kaardistamisel 1987 (T. Saadre); kirjeld Anne Põldvere, 1989; EGF 4311 |
| Estonian Land Board ID | 1434 |
| Date changed | 2022-11-21 |
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