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1.
Has the largest population
2.
Saint David is its patron saint
3.
Contains the tallest mountain: Ben Nevis
4.
Has the largest land area
5.
Its capital is Belfast
6.
Has the greatest ratio of sheep to people
Wales: 3.14, Scotland: 1.25, Northern Ireland: 1.07, England: 0.28
7.
Does not have its own legislature separate from the U.K Parliament
8.
Uses the flag of the U.K. as its official flag
9.
Home to the Principality (Millennium) Stadium
10.
Has the most offshore islands
11.
Has hosted golf's Open Championship, aka the British Open, the greatest number of times
12.
Has a village named Llanfairpwllgwyngyll
13.
Contains the county of Cornwall
14.
Home to the largest lake in U.K., which takes up about 3% of the country's surface area
15.
The Good Friday Agreement was signed there in 1998
16.
Contains ocean inlets known as the "Firth of Forth" and "Firth of Clyde"
17.
Tony Blair was born there
18.
Where the first name Dylan originally came from
I saw the "Principality" part, which gave me pause... but at the end I figured that was a red herring, because: no. The Millennium Dome is definitely in London.
Ah well!