2015Mediterranean Boats - First Day Cover single stamp

Located on the south-western edge of Europe, Portugal was classified as a border country by geographer Orlando Ribeiro. Boats travelling from the Atlantic Ocean and the Mediterranean Sea, which had been visiting the country since ancient times, strongly influenced Shipbuilding, leading Portuguese shipwrights to adopt two distinct techniques: Nordic clinker planking (overlapping planks and an end structure) and Mediterranean smooth planking (a front structure and juxtaposed planks).