Even though Denmark is a country in Northern Europe that is twice the size of Wales, the English capitol city of London has more people living in it.
One of the largest and most populated cities in the world, London has 8.308 million inhabitants according to records for 2013. In 2012, however, Denmark had only 5.59 million.
Even if you added the population of Wales to the demographics of Denmark - giving it 8.6m people - London would be very close to tying by only 0.3m.
According to data from Google, Denmark is 16,639 square miles in size, whereas London is a mere 607 square miles.