The Republic of Ireland. It has a border with Northern Ireland, which is part of the UK.
There is only one that is Northern Ireland (UK)
The portion of the UK that is Northern Ireland shares a border with Ireland (Republic of Eire) The rest of the UK is an island, and does not border any country.
Denmark proper only shares a land border with one country : Germany (68 km). Across the sea Denmark is surrounded by UK, Norway and Sweden.
The only country that borders the UK is the Republic of Ireland, which has a border with Northern Ireland, which is a part of the UK.
The Republic of Ireland is the only country to share a border with the UK.
Scotland is part of the UK, so the only 'country" in borders is England.
The UK is an island and doesn't share a land border with any other country. The UK is formed by England, Scotland, Wales. In addition Northern Ireland is part of the UK but it not connected by a land mass. Its seperated by the Irish Sea and North Channel. Not strictly true. England, Scotland and Wales is Great Britain. When Northern Ireland is included, the country then becomes 'The United Kingdom of Great Britain and Northern Ireland'. Great Britain doesn't share a border with any other country but the United Kingdom shares a border with the Republic of Ireland.
Spain shares borders with France, Portugal, Andorra, Morocco, and the UK. Pick any other country and it will not share a border with Spain.
Next to Norway is Sweden, Finland, and Russia!
On the island of Ireland you will find the country officially known as Ireland or Éire, sometimes referred to as the Republic of Ireland or incorrectly referred to as Southern Ireland. You will also find Northern Ireland on the island of Ireland.
Northern Ireland which is part of the UK