I suppose Costa Rico would have to be a peninsula jutting off the Coast of Central America into the Caribbean sea. Since the name “Costa Rico” is an imaginary concatenation of Costa Rica and Puerto Rico I guess the country would be a cross between the isthmus nature of Costa Rica and the island nature of Puerto Rico.
If you were really looking for a Costa Rico map or information this page is probably all you’ll find.
If you were really looking for Puerto Rico maps and information it’s here
If you were really looking for Costa Rica information and maps it’s here