| Ala 93 borehole, Valgamaa | Estonia | 58.0123, 25.6940 | 222 | 1 | 0 | 0 | 0 | |
| Ala 93A borehole | Estonia | 58.0126, 25.6902 | | 0 | 0 | 0 | 0 | |
| Ala K17 borehole | Estonia | 58.9596, 22.7979 | 165.2 | 3 | 0 | 0 | 0 | |
| Ala K55 borehole | Estonia | 58.9552, 22.8273 | 54.9 | 0 | 0 | 0 | 0 | |
| Alajõe borehole | Estonia | 59.0146, 27.4267 | | 3 | 0 | 0 | 0 | |
| Alatskivi 422 borehole | Estonia | 58.5888, 27.1423 | 441.4 | 9 | 42 | 16 | 15 | |
| Alavere F-281 borehole | Estonia | 59.2465, 25.3478 | 364.3 | 9 | 2 | 38 | 47 | |
| Allika 91 borehole, Saaremaa | Estonia | 58.3002, 22.7546 | 26.5 | 1 | 0 | 0 | 0 | |
| Ariste 902 borehole | Estonia | 58.5311, 23.0249 | 15 | 1 | 0 | 0 | 0 | |
| Alttoa F-125 borehole | Estonia | 59.5375, 25.6474 | 259 | 5 | 0 | 22 | 22 | |
| Annikvere F-148 borehole | Estonia | 59.4909, 26.2124 | 346 | 7 | 3 | 56 | 56 | |
| Apraksin Bor 17 borehole, Leningrad Oblast | Russia | 59.1792, 31.2608 | 274.8 | 6 | 82 | 418 | 328 | |
| Antonimäe K117 borehole | Estonia | 58.9900, 22.7765 | 50 | 0 | 0 | 0 | 0 | |
| Antonimäe K115 borehole | Estonia | 58.9895, 22.7808 | 30 | 0 | 0 | 0 | 0 | |
| Antonimäe K114 borehole | Estonia | 58.9920, 22.7825 | 60 | 0 | 0 | 0 | 0 | |
| Allika F-295 borehole, Harjumaa | Estonia | 59.3586, 24.5672 | 271.5 | 5 | 1 | 17 | 17 | |
| Anseküla 566 borehole | Estonia | 58.1135, 22.2355 | 26 | 0 | 0 | 7 | 0 | |
| B. Hatraz borehole | Russia | 58.6226, 28.1201 | | 0 | 0 | 0 | 0 | |
| Anijala 681 borehole, Saaremaa | Estonia | 58.3308, 22.3852 | 20.6 | 0 | 0 | 0 | 0 | |
| Angla 812 borehole | Estonia | 58.5463, 22.7231 | 70 | 3 | 0 | 0 | 0 | |
| Angerja F-288 borehole | Estonia | 59.1929, 24.8818 | 378 | 8 | 4 | 25 | 25 | |
| Anepalu F-286 borehole | Estonia | 59.2357, 25.0224 | 374.6 | 7 | 1 | 30 | 29 | |
| Andreyevo 13 borehole, Leningrad Oblast | Russia | 59.5506, 32.0329 | | 1 | 194 | 76 | 50 | |
| Ambla F-153 borehole | Estonia | 59.1977, 25.8092 | 440 | 10 | 4 | 65 | 81 | |
| Anseküla 610 borehole | Estonia | 58.1003, 22.2329 | 40 | 1 | 0 | 3 | 9 | |
