| 孀婦岩付近の海底地形。孀婦岩南西に火口地形と思われる直径2km程度の凹地がある。５万分の１沿岸の海の基本図「孀婦岩」（海上保安庁水路部、1995）より作成。 |
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| Bathymetric map around "Sofugan (Lots Wife Rocks)" based on Basic Map of the Sea (1:50,000) "Sofugan" (Japan Coast Guard, 1995) showing ca. 2km-wide small depressions southeast of Sofugan, presumably a crater. |