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How big is 721.9 cubic kilometers?

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It's about one-fifth as big as an Halley's Comet.
In other words, 721.9 cubic kilometers is 0.18 times the size of an Halley's Comet, and the size of an Halley's Comet is 5.6 times that amount.
(Comet Halley, officially "1P/Halley") (volume calculated based on 2005 dimensions)
It's about one-fifth as big as The Grand Canyon.
In other words, 721.9 cubic kilometers is 0.173 times the size of The Grand Canyon, and the size of The Grand Canyon is 5.78 times that amount.
(Coconino County and Mohave Counties, Arizona, near Fredonia and Grand Canyon, Arizona)
A dynamic and continuously changing landscape, the Grand Canyon has an approximate volume of 4,170 cubic kilometers. The strata of the rock visible in the Canyon's walls display nearly 2 billion years of geological history.
It's about 1,500 times as big as Sydney Harbour.
In other words, 721.9 cubic kilometers is 1,280 times the size of Sydney Harbour, and the size of Sydney Harbour is 0.000781 times that amount.
(formally Port Jackson, a.k.a. Sydney Harbor) (Sydney, New South Wales, Australia) (total estuary water volume at high tide)
It's about one-three-thousand-five-hundredth as big as The Gulf of Mexico.
In other words, 721.9 cubic kilometers is 0.0002966 times the size of The Gulf of Mexico, and the size of The Gulf of Mexico is 3,372 times that amount.
(water volume)
The Gulf of Mexico contains 2,434,000 cubic kilometers of water. Every second, the Mississippi River empties 0.000012 cubic kilometers of water into the Gulf.
It's about 300,000 times as big as The Great Pyramid of Giza.
In other words, 721.9 cubic kilometers is 297,370.2 times the size of The Great Pyramid of Giza, and the size of The Great Pyramid of Giza is 0.000003362812 times that amount.
(a.k.a. Pyramid of Khufu, a.k.a. Pyramid of Cheops) (Cairo, Egypt) (including internal hillock)
It's about 400,000 times as big as The Melbourne Cricket Ground.
In other words, 721.9 cubic kilometers is 420,000 times the size of The Melbourne Cricket Ground, and the size of The Melbourne Cricket Ground is 0.0000024 times that amount.
(a.k.a. MCG, a.k.a. "The G") (Yarra Park, melbourne, Victoria, Australia) (internal volume)
It's about 600,000 times as big as The Houston Astrodome.
In other words, the size of The Houston Astrodome is 0.0000017 times 721.9 cubic kilometers.
(a.k.a. Reliant Astrodome, a.k.a. Astrodome, a.k.a. Harris County Domed Stadium) (Houston, Texas)