Spain is situated on the Iberian Peninsula and is surrounded by the Mediterranean Sea, the Atlantic Ocean, and the Bay of Biscay. The mainland is dominated by high plateaus and mountain ranges, as well as several major rivers. Alluvial plains can be found along the coast. Spain can be divided into : the humid and very green north, the scarcely populated and never ending coastal plains, the fertile, sunny Spain on the Mediterranean Sea, the most well known, hot and dry south – Andalusien – and two groups of small islands, the Balearic and the Canary Islands.