They are islands in the Atlantic Ocean and the Caribbean Sea between South America and the United States.
See:Caribbean - Wikipedia, the free encyclopedia
Student or Learner
What is 'West Indies'?
Thanks in advance.
I'll just call special attention to one bit of the Wikipedia article: '[the term] 'West Indies' originates from Christopher Columbus' idea that he had landed in the Indies (then meaning all of south and east Asia) when he had actually reached the Americas.' This accounts for the apparent geographical strangeness of the name.