It's about 150 times as big as Abel Tasman National Park
In other words, 31,000,000 dunams is 137.6 times the size of Abel Tasman National Park, and the size of Abel Tasman National Park is 0.00727 times that amount.(Tasman District, South Island, New Zealand)
New Zealand's Abel Tasman National Park measures about 225,300 dunams in total area. The size of the park has increased over the years as donated parcels of land have been added to it, with the last expansion in 2008 adding 7,900 dunams.
It's about 200 times as big as Washington, D.C.
In other words, 31,000,000 dunams is 175 times the size of Washington, D.C., and the size of Washington, D.C. is 0.0057 times that amount.(formally the District of Columbia, a.k.a. Washington, a.k.a. the District, a.k.a. DC) (United State)
The United States' capital and only federal district, Washington, D.C. is a 177,000 dunams area located between the states of Virginia and Maryland. Washington, D.C. is known as the center of each of the three branches of the United States federal government and as home to many of the nation's monuments, museums, and foreign embassies.
It's about one-two-hundred-fiftieth as big as Brazil
In other words, 31,000,000 dunams is 0.00364069 times the size of Brazil, and the size of Brazil is 274.6734 times that amount.(a.k.a. Brasil, formally the Federative Republic of Brazil, a.k.a. Rep&blica Federativa do Brasil)
Brazil measures 8,514,877,000 dunams in total area. Brazil is the world's fifth-largest country by area and eighth-largest economy (by GDP).
It's about 300 times as big as Hilton Head
In other words, 31,000,000 dunams is 284.764 times the size of Hilton Head, and the size of Hilton Head is 0.0035117 times that amount.(a.k.a. Hilton Head Island) (South Carolina)
Hilton Head Island measures 108,860 dunams in total land area. The island (and city of the same name) is located in the Atlantic Ocean and is known as popular vacation destination.
It's about 300 times as big as Disney World
In other words, 31,000,000 dunams is 307 times the size of Disney World, and the size of Disney World is 0.0033 times that amount.(a.k.a. Walk Disney World Resort, a.k.a. Walt Disney World, a.k.a. WDW) (Lake Buena Vista and Bay Lake, Florida) (total site)
Disney World currently occupies 101,000 dunams. Part of the former total area of 120,000 dunams now comprises the Disney planned community of Celebration, Florida.
It's about one-three-hundredth as big as China
In other words, 31,000,000 dunams is 0.00323019 times the size of China, and the size of China is 309.5794 times that amount.(a.k.a. People's Republic of China, a.k.a. 中华人民共和国, a.k.a.中華人民共和國 , a.k.a. Zhōnghuá Rénmín Gònghég) (UN mainland area figure)
Mainland China, as measured by the United Nations (excluding China's Special Administrative Regions — Hong Kong and Macau — and disputed territories such as Taiwan, Askai Chin, and the Trans-Karakoram Tract), occupies 9,596,961,000 dunams in total area . China is the the most populous country in the world and the third or fourth largest (depending on areas included in the measurement) in total area.
It's about one-three-hundredth as big as United States
In other words, 31,000,000 dunams is 0.00315468 times the size of United States, and the size of United States is 316.9896 times that amount.(a.k.a. United States of America, a.k.a. America, a.k.a. USA, a.k.a. US)
The third or fourth largest country in the world (there is some dispute in how China's total area is measured), the United States measures 9,826,675,000 dunams in total area. The United States is the third-most populous country in the world, home to over 300 million people.