It's about one-two-thousandth as big as Michigan
In other words, 30,000 acres is 0.000484666 times the size of Michigan, and the size of Michigan is 2,063.277 times that amount.(United States)
The "Great Lakes State," Michigan measures 61,898,320 acres in total area. According to some studies, there is no point in Michigan that is more than 9.66 km (6 mi) from a lake or 136.79 km (85 mi) from a Great Lake.
It's about 2,500 times as big as Windsor Castle
In other words, 30,000 acres is 2,300 times the size of Windsor Castle, and the size of Windsor Castle is 0.0004 times that amount.(Windsor, England) (total site area)
One of the official residences of the British monarch, Windsor Castle measures about 13 acres. It is the largest inhabited castle in the world and is also the oldest in continuous use, having been occupied since it was built by William the Conqueror about 900 years ago.
It's about 2,500 times as big as Rogers Centre
In other words, 30,000 acres is 2,360 times the size of Rogers Centre, and the size of Rogers Centre is 0.00042 times that amount.(f.k.a. Skydome) (Toronto, Ontario, Canada) (entire complex)
Rogers Centre, a major sports stadium in downtown Toronto, measures a total of 12.70 acres over the entire complex. The video board of Rogers Centre has a total area of 0.084 acres.
It's about 2,500 times as big as a Polo field
In other words, 30,000 acres is 2,420 times the size of a Polo field, and the size of a Polo field is 0.0004132231 times that amount.(for field polo) (United States Polo Association rules; unboarded side maximum)
An outdoor polo field must measure 274.32 m in length and 146.304 m to in width for a total playing area of up to 12.39669420 acres. Polo traces its origins to an Iranian (then Persian) war game from the 5th Century, which was played with as many as 100 players per side.
It's about one-three-thousandth as big as The Great Barrier Reef
In other words, 30,000 acres is 0.00035 times the size of The Great Barrier Reef, and the size of The Great Barrier Reef is 2,870 times that amount.(a.k.a. Barrier Reef) (Coral Sea, off Queensland, Australia) (approximate)
The Great Barrier Reef, the largest such reef in the world, covers about 86,000,000 acres. Reefs, such as the Great Barrier, grow in diameter at a rate of 1 to 3 cm per year.
It's about 3,000 times as big as The Philippine Arena
In other words, 30,000 acres is 3,000 times the size of The Philippine Arena, and the size of The Philippine Arena is 0.0003 times that amount.(Ciudad De Victoria, Bocaue - Bulacan, Philippines) (total footprint)
The largest indoor arena in the world, the multi-use Philippine Area has a total footprint of 9.90 acres, with the dome itself occupying 8.90 acres. The floor the arena contains over 9,000 tons of steel.
It's about 3,000 times as big as The Principality Stadium
In other words, 30,000 acres is 3,000 times the size of The Principality Stadium, and the size of The Principality Stadium is 0.000 times that amount.(a.k.a. Stadiwm Principality, f.k.a. Millennium Stadium, f.k.a. Stadiwm y Mileniwm) (Cardiff, Wales, United Kingdom) (total footprint)
The 70,000-person-plus capacity stadium of Cardiff, Principality Stadium has a total footprint of 10 acres. Over 40,000 tonnes of concrete and steel during the construction of the stadium.