floating island
US /ˈfloʊtɪŋ ˈaɪlənd/
UK /ˈfloʊtɪŋ ˈaɪlənd/

1.
a dessert consisting of meringue floating on a pool of crème anglaise, often garnished with caramel or nuts
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For dessert, I ordered the delicate floating island.
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The chef's special was a deconstructed floating island.
2.
a mass of vegetation, soil, or ice that floats on the surface of a body of water
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We saw a large floating island of reeds in the lake.
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The river current carried the small floating island downstream.