| Eastern Gemini Seamount | |
| Depth: | 80 meters (262 feet) |
| Location: | Southwestern Pacific Ocean |
| Coordinates: | -20.98°N 170.28°W |
| Country: | France or Vanuatu |
| Last Eruption: | February 1996 |
The Eastern Gemini Seamount, also known as Oscostar, is a seamount in the southwestern Pacific Ocean, about halfway between Vanuatu's Tanna and Matthew Islands. The only recorded eruption from Eastern Gemini was observed by a passing ship on February 18, 1996 when bursts of very dark water were observed.[1]