It's about as big as Delaware.
In other words, the size of Delaware is 0.99999995399790 times 644,718 hectares.(United States)
The "First State," Delaware measures 644,718 hectares in total area. Its 19.3 km (12 mi) border with Pennsylvania, referred to as "Twelve-Mile Circle" is the only circular state boundary in the United States.
It's about one-and-one-tenth times as big as Prince Edward Island.
In other words, 644,718 hectares is 1.134290 times the size of Prince Edward Island, and the size of Prince Edward Island is 0.8816090 times that amount.(a.k.a. PEI, a.k.a. P.E.I., a.k.a. Île-du-Prince-Édouard, a.k.a. Eilean a' Phrionnsa, a.k.a. Garden of the Gulf, a.k.a. Birthplace of the Confederation, a.k.a. Île Saint-Jean)
Prince Edward Island, located off Canada's eastern coast in the Gulf of St. Lawrence, measures 568,391 hectares in total area. Significant among Prince Edward Island's industries is agriculture, with the island producing 1.3 billion kg (1.4 million tons) of potatoes each year — almost 21% the output of the US state of Idaho with 3% as much land.
It's about four-fifths as big as Juneau.
In other words, 644,718 hectares is 0.80790780 times the size of Juneau, and the size of Juneau is 1.2377650 times that amount.(a.k.a. the City and Borough of Juneau) (Alaska)
The capital of Alaska and third-largest city in both Alaska and the United States, Juneau measures 798,009.40 hectares in total area. Juneau is a port of call for many cruise ships voyaging off the Alaskan coast during the summer season.
It's about one-and-one-fourth times as big as Anchorage.
In other words, 644,718 hectares is 1.2690490 times the size of Anchorage, and the size of Anchorage is 0.78799160 times that amount.(formally the Municipality of Anchorage, a.k.a. MOA) (Alaska)
The fourth-largest city in Alaska and in the country, Anchorage measures 508,032.30 hectares in total area. The city is the home of a large energy industry, a hub for air and overseas cargo traffic, and home to nearly half of Alaska's population.
It's about one-and-three-tenths times as big as Grand Canyon National Park.
In other words, 644,718 hectares is 1.30758770 times the size of Grand Canyon National Park, and the size of Grand Canyon National Park is 0.7647670590 times that amount.(Coconino County and Mohave Counties, Arizona, near Fredonia and Grand Canyon, Arizona)
Containing the 446 km (277 mi) Grand Canyon gorge, Grand Canyon National Park covers 493,059 hectares.
It's about three-fourths as big as Puerto Rico.
In other words, 644,718 hectares is 0.7268510 times the size of Puerto Rico, and the size of Puerto Rico is 1.37580 times that amount.(formally the Commonwealth of Puerto Rico, a.k.a. Estado Libre Asociado de Puerto Rico) (United States)
A self-governing territory of the United States located in the Caribbean Sea, Puerto Rico is an archipelago with 887,000 hectares in total land area. The island is known as a popular tourist destination.
It's about one-and-two-fifths times as big as Fort Bliss.
In other words, 644,718 hectares is 1.420 times the size of Fort Bliss, and the size of Fort Bliss is 0.7040 times that amount.(near Las Cruces, New Mexico and El Paso, Texas)
Fort Bliss is the United States Army's second-largest installation with a total area of 453,000 hectares. It is known as the largest TRADOC (Training and Doctrine Command) site, the Army's largest maneuver area, and the country's largest contiguous tract of open airspace.