The Republic of Indonesia is the largest archipelago in the world comprising 17,504 large and small tropical islands fringed with white sandy beaches, many still uninhabited and a number even still unnamed. Straddling the equator, situated between the continents of Asia and Australia and between the Pacific and the Indian Oceans, it is as wide as the United States from San Francisco to New York, equaling the distance between London and Moscow.  Indonesia has a total population of more than 215 million people from more than 200 ethnic groups. The national language is Bahasa Indonesia.
REGIONS
Among the most well known islands are Sumatra, Java, Bali, Kalimantan (formerly Borneo), Sulawesi (formerly Celebes), the Maluku Islands (or better known as Moluccas, the original Spice Islands) and Papua. Then, there is Bali “the world’s best island resort” with its enchanting culture, beaches, dynamic dances and music. But Indonesia still has many unexplored islands with grand mountain views, green rainforests to trek through, rolling waves to surf and deep blue pristine seas to dive in where one can swim with dugongs, dolphins and large mantarays.
Indonesia is blessed with the most diverse landscape, from fertile ricelands on Java and Bali to the luxuriant rainforests of Sumatra, Kalimantan and Sulawesi, to the savannah grasslands of the Nusatenggara islands to snow-capped peaks of West Papua.
HISTORY
Ever since prehistoric times the Indonesian archipelago has been inhabited. Java Man or pithecanthropus erectus (upright apeman) is the oldest known inhabitant here, having lived over a million years ago. Other more recent prehistoric species include the still disputed homo Floresiensis, or the Flores hobbits, dwarf people, who have also made these islands their home. From 1294 to the 15th century the powerful Majapahit Kingdom in East Java held suzerainty over a large part of this archipelago. Meanwhile, small and large sultanates thrived on many islands of the archipelago, from Sumatra to Java and Bali, to Kalimantan, Sulawesi, Ternate and the Moluccas.

Throughout history, traders have brought the world’s large religions of Buddhism, Hinduism and Islam to this archipelago, deeply influencing this country’s culture and way of life. Yet Indonesia was never conquered by India nor China, until Europeans came and colonized these islands. Revolt against the colonizers soon built up throughout the country, and finally, on 17 August 1945, after the defeat of the Japanese in the Second World War, the Indonesian people declared their Independence through their leaders Soekarno and Hatta.

LANGUAGE
Bahasa Indonesia is the national and official language in the entire country. It is the language of official communication, taught in schools and spoken on television. Most Indonesians today speak at least two languages or more, Bahasa Indonesia and their local language, of which Indonesia counts more than 300 regional languages.
CLIMATE
Being a tropical country, Indonesia is blessed with two seasons, namely dry and rainy. Dry usually occurs from June to September and the rest is rainy season. Sunshine is abundant except in rainy season when the sky tends to be cloudy. It is advisable to visit Indonesia during dry season.
PEOPLE AND CULTURE
Living on more than 17,000 islands, the Indonesian nation today counts some 200 million population comprising more than 200 ethnic groups. The majority of the population embraces Islam, while in Bali the Hindu religion is predominant. Whereas in areas like the Minahasa in North Sulawesi, the Toraja highlands in South Sulawesi, in the East Nusatenggara islands and in large parts of Papua, in the Batak highlands as well as on Nias island in North Sumatra, the majority are either Catholics or Protestants.
The Indonesian archipelago harbours many ancient cultures that are rooted here, while throughout its history through centuries until today the islands have been influenced by Indian, Chinese, Arabic and European cultures, and lately also by the global popular culture, international travel and internet. Foreign cultures and traditions, however, are absorbed and assimilated by the people producing unique “Indonesian” creations found nowhere else in the world.
On 2 October 2009, UNESCO recognized Indonesia’s “Batik” as World Intangible Cultural Heritage, adding to the earlier recognized Indonesia’s “Keris” (the wavy blade dagger), and the “Wayang” shadow puppets. Further being considered as World Heritage is the “Angklung” bamboo musical instrument from West Java, being uniquely “Indonesian”.
sumber : KBRI tokyo