Amapá is one of the 27 federative units of Brazil, located in the extreme north, bordering French Guiana and Suriname to the north. To the east is the Atlantic Ocean, and to the south and west is the Brazilian state of Pará.
Perhaps one of the main features of the state is the River Oiapoque, as it was once considered the northernmost point of Brazil. The river's estuary is at the extreme north of the Brazilian coast, and it is often used to describe the remote points of Brazil. The dominant landscape of the region - 90 percent of the total area - is the huge Amazon Rainforest. Unexplored forests occupy 70 percent of its territory. Another attraction is the equator, which divides not only the state but also the Northern and Southern hemispheres.
The capital and largest city is Macapá - and the only way to reach it is by boat or aeroplane.
Its population is around 670,000.
For more details see http://en.wikipedia.org/wiki/Amap%C3%A1