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]

Eastern Gemini Seamount
Summit depth	80 meters (262 feet)
Location
Location	Southwestern Pacific Ocean
Coordinates	20°59′S 170°17′E / 20.98°S 170.28°E / -20.98; 170.28
Country	France or Vanuatu
Geology
Type	Submarine volcano
Last eruption	February 1996