Trinidad is an island, so it doesn't share a border with any other countries.
Barbados is an island country in the Caribbean, and it has no land borders. It is surrounded by the Atlantic Ocean to the east and the Caribbean Sea to the west.
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jamica
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united kindom
When countries share a border it is referred to as a "common or shared" border.
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barbados
· Barbados
Jamaica is an island.No countries border it.