Rhamnous, also Ramnous or Rhamnus, was an ancient Greek city in Attica situated on the coast, overlooking the Euboean Strait. Its ruins lie northwest of the modern town of Agia Marina in the municipality of Marathon.

Attica, or the Attic Peninsula, is a historical region that encompasses the entire Athens metropolitan area, which consists of the city of Athens, the capital of Greece and the core city of the metropolitan area, as well as its surrounding suburban cities and towns. It is a peninsula projecting into the Aegean Sea, bordering on Boeotia to the north and Megaris to the west. The southern tip of the peninsula, known as Laurion, was an important mining region.