Quick Answer: Ibiza is located in the western Mediterranean Sea, 80-90 kilometers (50-56 miles) off Spain's eastern coast, at coordinates 38.9067°N, 1.4206°E. It's the third-largest island in Spain's Balearic archipelago, covering 572 square kilometers (221 square miles) with stunning coastlines, rolling hills, and strategic positioning that has made it a cultural crossroads for over 2,500 years.