It's about as big as an Halley's Comet.
(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 35,000,000,000,000 barrels. 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 as big as The Grand Canyon.
In other words, the size of The Grand Canyon is 1.03 times 35,000,000,000,000 barrels.(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 36,100,000,000,000 barrels. The strata of the rock visible in the Canyon's walls display nearly 2 billion years of geological history.
It's about one-six-hundredth as big as The Gulf of Mexico.
In other words, 35,000,000,000,000 barrels is 0.001663 times the size of The Gulf of Mexico, and the size of The Gulf of Mexico is 601.30 times that amount.(water volume)
The Gulf of Mexico contains 21,050,000,000,000,000.000000000000000000000 barrels of water. Every second, the Mississippi River empties 103,800 barrels of water into the Gulf.
It's about 7,000 times as big as Sydney Harbour.
In other words, 35,000,000,000,000 barrels is 7,200 times the size of Sydney Harbour, and the size of Sydney Harbour is 0.000139 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 4,860,000,000 barrels 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-hundred-fifty-thousandth as big as Earth's Oceans.
In other words, the size of Earth's Oceans is 340,000 times 35,000,000,000,000 barrels.(Total water volume of Atlantic, Pacific, Indian, Arctic, and Southern Oceans) (estimated)
Over 97% of the Earth's water is found in the planet's five oceans for a total volume of about 12,000,000,000,000,000,000.0000000000000000000000 barrels. The Pacific Ocean is the largest ocean, covering 165,760,000 sq. km — more than double the area of the Atlantic Ocean at 82,400,000 sq. km.
It's about 1,500,000 times as big as The Great Pyramid of Giza.
In other words, 35,000,000,000,000 barrels is 1,667,064 times the size of The Great Pyramid of Giza, and the size of The Great Pyramid of Giza is 0.0000005998570 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 20,995,000 barrels 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 2,500,000 times as big as The Melbourne Cricket Ground.
In other words, the size of The Melbourne Cricket Ground is 0.000000420 times 35,000,000,000,000 barrels.(a.k.a. MCG, a.k.a. "The G") (Yarra Park, melbourne, Victoria, Australia) (internal volume)
The MCG has an internal volume of approximately 15,000,000 barrels. 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."