Miami is a city in the state of Florida in the US. There is no "border" with Miami and another nation.
Mauritania, has the longest border with Mali located in Western Africa.
At 8891 km, the border between Canada and the USA is the longest between any two countries, but a major section of that border (with Alaska) is not contiguous with the rest. The longest contiguous section of border between two countries in the world is between Russia and Kazakhstan, at 6846 km.
Nouakchott
No, Ontario has the longest border with Canada and the US.
canada
CanadaCanada shares the longest border with the US.
The US-Canada border is the longest border in the world. It stretches for 8,891 km.
The USA's longest border is with Canada.
border
Florida has the longest border on the Atlantic Ocean among US states.
Between Canada and the US. ================================================================================ An open border is one that allows unrestricted entry and exit. The border between Canada and the US has been described as the world's longest "undefended" border, but it is not an "open" border. Even the "undefended" concept of the Canada-US border is now being questioned.