
According to Adobe: “A “modern”‘ PDF file can be 15,000,000 inches in each direction.” 15 million Inches is 38,100,000 cm or 236.74 miles or 381 km.
Therefore, a PDF could in theory cover an area of 56,045 sq miles or 145,161 km2. This is an area slightly larger than New York state or Greece.
The map above shows what this would look like over Europe. Below is the same map but with cities included:









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