| Name | Hakjala 687 borehole |
| Number | 687 |
| Type | borehole (section) |
| Country | Estonia |
| Parish | Kaarma |
| Settlement | Hübja |
| Elevation | 24.00 |
| Coordinates | 58.40533, 22.48735 |
| Coord. agent | Eesti Geoloogiakeskus (EGK) |
| Location remarks | Kuressaare-Panga mnt Aste teeristilt 4.5 km kirdes ehk Piilast ~4km edelas |
| Strat. top | Paadla Stage |
| Strat. base | Rootsiküla Stage |
| Remarks | Puuritud 1993. a. H. Perens; EGF 4700 |
| Estonian Land Board ID | 28169 |
| Date changed | 2019-03-19 |
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