kipuka
noun
ki·pu·ka
kēˈpükə
plural -s
: an area of older land ranging in size from a few square feet to several square miles surrounded by later lava flows
kipukas result from either topographic irregularities or the viscosity of the lava—H. T. Stearns & G. A. Macdonald
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Merriam-Webster unabridged
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