Seoul is by far South Korea's largest city and one of East Asia's financial and cultural hubs, with a municipal population of over 10.5 million and a metropolitan population of over 20.5 million. According to some estimates, it is the world's second largest urban agglomeration, after Greater Tokyo.
The Philippines is the world's second largest archipelago, after Indonesia, with over 7,100 islands. The islands are largely volcanic in nature and are covered in tropical rainforest and fertile soil, though most of the rainforest has been cleared. Although the terrain varies greatly, many of the coasts have numerous bays and headlands, and many of the larger islands have mountainous interiors.