Geography
Jacquemart Island consists of a stack with an area of 19 ha (47 acres), being about 750 m (2,461 ft) in length by 500 metres (1,640 ft) in width and surrounded by precipitous cliffs at least 30 m (98 ft) high at their lowest. Its highest point is about 200 m (656 ft) asl. It is an eroded remnant of basaltic lavas originally laid down on a sedimentary base. Because of its inaccessibility from the sea, the first visit by humans to the island did not take place until 29 December 1980 when a small party of scientists was landed by helicopter on the summit ridge for a 90 minute survey. Subsequent short visits were made in 1984 and 1997.
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