What four islands or keys Overseas Highway crosses?

Alot. google.com/maps?q=Overseas+Hwy,+Florida&oe=UTF-8&ie=UTF8&hl=en&oi=georefine&ct=clnk&cd=1&geocode=Fcl9fQEdNh0z-w&split=0">http://maps.google.com/maps?q=Overseas+Hwy,+Florida&oe=UTF-8&ie=UTF8&hl=en&oi=georefine&ct=clnk&cd=1&geocode=Fcl9fQEdNh0z-w&split=0 (Be sure to zoom to see all the keys.)