The UK is a little larger than Bulgaria in terms of land area, with a total area of approximately 244,000 km2 (94,000 square miles). Bulgaria has a land area of approximately 111,000 km2 (43,000 square miles), which is about half the size of the UK.
However, Bulgaria is much more densely populated than the UK, with a population of around 6.9 million people compared to the UK's 67 million. This means that Bulgaria has a much higher population density, with about 63 people per km2 (163 per square mile) compared to the UK's 275 people per km2 (712 per square mile).