Passage: Japan has a total of 6,852 islands extending along the Pacific coast. It is over 3,000 km (1,900 mi) long from the Sea of Okhotsk to the Philippine Sea in the Pacific Ocean. The country, including all of the islands it controls, lies between latitudes 24° and 46°N, and longitudes 122° and 146°E. The main islands, from north to south, are Hokkaido, Honshu, Shikoku and Kyushu. The Ryukyu Islands, which include Okinawa, are a chain to the south of Kyushu. The Nanpō Islands are south of the main islands of Japan. Together they are often known as the Japanese archipelago. As of 2018, Japan's territory is 377,973.89 km2 (145,936.53 sq mi). It is the largest island country in East Asia. Japan has the sixth longest coastline in the world (29,751 km (18,486 mi)). It doesn't have land borders. Due to its many far-flung outlying islands, Japan has the eighth largest Exclusive Economic Zone in the world covering 4,470,000 km2 (1,730,000 sq mi).About 73 percent of Japan is forested, mountainous and unsuitable for agricultural, industrial or residential use. As a result, the habitable zones, mainly located in coastal areas, have extremely high population densities. Japan is one of the most densely populated countries in the world.Approximately 0.5% of Japan's total area is reclaimed land (umetatechi). It began in the 12th century. Late 20th and early 21st century projects include artificial islands such as Chubu Centrair International Airport in Ise Bay, Kansai International Airport in the middle of Osaka Bay, Yokohama Hakkeijima Sea Paradise and Wakayama Marina City. The village of Ogata in Akita, Japan, was established on land reclaimed from Lake Hachirōgata starting in 1957. By 1977, the amount of land reclaimed totaled 172.03 km2 (66.42 sq mi). The Isahaya Bay reclamation project (諫早湾干拓事業) in Isahaya, Nagasaki started in 1989 and a total of 35 km2 (14 sq mi) has been reclaimed as of 2018.

Question: Where are the majority of Japan's habitable zones found?
coastal areas