The 87 kmÂ island is divided roughly in half between France and the Netherlands ; it is the smallest inhabited sea island divided between two nations . The 87 km2 island is divided roughly 60\/40 between France ( 53 km2 ) and the Netherlands ( 34 km2 ) ; however , the Netherlands side has the larger population . It is the smallest inhabited sea island divided between two nations , a division dating to 1648 .