The term 'Large Greek Island' can be summarized by two crossword solutions: Euboea (6 letters) and CRETE (5 letters). Euboea is the second largest Greek island, located in the Aegean Sea. It is known for its mountainous terrain and its many beaches. CRETE is the largest of the Greek islands, located in the Mediterranean Sea. It is known for its rich history, archaeological sites, and beautiful landscapes.