It's about 0.00000000000003 times as big as Earth's Oceans
In other words, 2,500,000,000 tablespoons is 0.0000000000000260 times the size of Earth's Oceans, and the size of Earth's Oceans is 38,000,000,000,000 times that amount.(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 94,999,999,999,999,993,708,544.0000000000000000000000000 tablespoons. 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 0.00000000002 times as big as The Gulf of Mexico
In other words, 2,500,000,000 tablespoons is 0.000000000015190 times the size of The Gulf of Mexico, and the size of The Gulf of Mexico is 65,830,000,000 times that amount.(water volume)
The Gulf of Mexico contains 164,600,000,000,000,000,000.0000000000000000000000000 tablespoons of water. Every second, the Mississippi River empties 811,500,000 tablespoons of water into the Gulf.
It's about 0.000000009 times as big as The Grand Canyon
In other words, 2,500,000,000 tablespoons is 0.000000008860 times the size of The Grand Canyon, and the size of The Grand Canyon is 113,000,000 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 282,000,000,000,000,000.000000000000000000000 tablespoons. The strata of the rock visible in the Canyon's walls display nearly 2 billion years of geological history.
It's about 0.000000009 times as big as an Halley's Comet
In other words, 2,500,000,000 tablespoons is 0.00000000920 times the size of an Halley's Comet, and the size of an Halley's Comet is 110,000,000 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 270,000,000,000,000,000.00000000000000000000 tablespoons. 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-fifteen-thousandth as big as Sydney Harbour
In other words, the size of Sydney Harbour is 15,200 times 2,500,000,000 tablespoons.(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 38,000,000,000,000 tablespoons 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-sixty-fifth as big as The Great Pyramid of Giza
In other words, 2,500,000,000 tablespoons is 0.01522767 times the size of The Great Pyramid of Giza, and the size of The Great Pyramid of Giza is 65.669930 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 164,174,800,000 tablespoons 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 one-forty-fifth as big as The Melbourne Cricket Ground
In other words, the size of The Melbourne Cricket Ground is 45 times 2,500,000,000 tablespoons.(a.k.a. MCG, a.k.a. "The G") (Yarra Park, melbourne, Victoria, Australia) (internal volume)
The MCG has an internal volume of approximately 110,000,000,000 tablespoons. 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."