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How big is 13 cubic kilometers?

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It's about twenty times as big as Sydney Harbour.
In other words, 13 cubic kilometers is 23.10 times the size of Sydney Harbour, and the size of Sydney Harbour is 0.0433 times that amount.
(formally Port Jackson, a.k.a. Sydney Harbor) (Sydney, New South Wales, Australia) (total estuary water volume at high tide)
Lending the term "sydharb" or "sydarb" to comparable quantities of water, Sydney Harbor contains approximately 0.5620 cubic kilometers of water. Snapper Island, a onetime naval facility loocated in the Harbour, was transformed by the dredging efforts of the Australian Navy from a 2,360 sq. m (25,400 sq. ft) outcropping to a 16,500 sq. m (178,000 sq. ft) island shaped roughly in the outline of a boat.
It's about one-three-hundredth as big as an Halley's Comet.
In other words, 13 cubic kilometers is 0.0032 times the size of an Halley's Comet, and the size of an Halley's Comet is 310 times that amount.
(Comet Halley, officially "1P/Halley") (volume calculated based on 2005 dimensions)
Halley's Comet, the famous comet visible to observers on Earth approximately every 76 years, has a peanut- or potato-shaped nucleus made of rock, dust, ice, and various frozen gasses. The nucleus measures approximately 15 km by 8 km by 8 km, which yields a calculated volume of 4,023 cu. km. The coma of the Comet — the trail of sublimated gasses that give the Comet its visibility — may be up to 100,000 km in length.
It's about one-three-hundredth as big as The Grand Canyon.
In other words, 13 cubic kilometers is 0.00312 times the size of The Grand Canyon, and the size of The Grand Canyon is 321 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 5,500 times as big as The Great Pyramid of Giza.
In other words, 13 cubic kilometers is 5,355.052 times the size of The Great Pyramid of Giza, and the size of The Great Pyramid of Giza is 0.0001867395 times that amount.
(a.k.a. Pyramid of Khufu, a.k.a. Pyramid of Cheops) (Cairo, Egypt) (including internal hillock)
The Great Pyramid of Giza has an estimated volume of 0.002427614 cubic kilometers including its internal hillock. The 2,300,000 stones used in the construction of the pyramid weighed an average 2.27 metric tons (2.06 short tons) and were quarried at distances of up to 805 km (500 mi) away.
It's about 7,500 times as big as The Melbourne Cricket Ground.
In other words, the size of The Melbourne Cricket Ground is 0.00013 times 13 cubic kilometers.
(a.k.a. MCG, a.k.a. "The G") (Yarra Park, melbourne, Victoria, Australia) (internal volume)
The MCG has an internal volume of approximately 0.0017 cubic kilometers. The first cricket game held on the site of the MCG was in 1853 when the Melbourne Cricket Club was granted permission to a roughly 0.04 sq. km (10-acre) area to be used "for cricket and no other purpose."
It's about 10,000 times as big as The Houston Astrodome.
In other words, 13 cubic kilometers is 11,000 times the size of The Houston Astrodome, and the size of The Houston Astrodome is 0.0000910 times that amount.
(a.k.a. Reliant Astrodome, a.k.a. Astrodome, a.k.a. Harris County Domed Stadium) (Houston, Texas)
The Reliant Astrodome measures 0.0012 cubic kilometers in total volume. Until its renovation in 1988, Roy "The Judge" Hofheinz, the franchise owner of the Houston Colt .45s (later the Houston Astros) and one of the Astrodome's developers, had a private 966 sq. m (10,400 sq. ft) apartment in the facility.
It's about 150,000 times as big as Royal Albert Hall.
In other words, the size of Royal Albert Hall is 0.0000066670 times 13 cubic kilometers.
(a.k.a. Royal Albert Hall of Arts and Sciences) (Westminster, London, England, United Kingdom) (total auditorium volume)
Royal Albert Hall measures 0.000086650 cubic kilometers in total auditorium volume. One of the centerpieces of the Hall is the Grand Organ — the second-largest organ in the United Kingdom, with 10,268 speaking pipes reaching up to 9.8 m (32 ft) in height.