Britain's status as an island.
Winston Churchill
Yes.
The main geographic defence was the body of water between mainland Europe and Great Britain. This body of water was controlled by the greatest navy on the planet.
The British Empire
Many of their enemy's navies did not stand a chance against Great Britain's navy making it almost impossible to invade.
The Continental System was designed to hurt Great Britain and the British Empire.
Russia Empire (including Congress Poland), Great Britain, the Netherlands, and Ottoman Empire. And barely Sweden and Norway.
great britain
The British Empire. Great Britain is the latgest island of the British Isles.
Spain's neighbors are France, Portugal, Andorra, Morocco, and Great Britain.
Australia
Australia was once a colony of Great Britain.