The Mamberamo river, sometimes referred to as the "Amazon of Papua" is the province's largest river which winds through the northern part of the province. The result is a large area of lakes and rivers known as the Lakes Plains region. The famous Baliem Valley, home of the Dani people is a tableland 1600 m above sea level in the midst of the central mountain range; Puncak Jaya, sometimes known by its former Dutch name Carstensz Pyramid, is a mist covered limestone mountain peak 4884 m above sea level.

Papua is the largest province of Indonesia, comprising a majority part of the western half of the island of New Guinea and nearby islands. The province originally covered the entire western half of New Guinea, but in 2003, the western portion of the province, on the Bird's Head Peninsula, was declared by the Indonesian Government as a separate province named West Papua. The legality of this separation has been disputed as it appears to conflict with the conditions of the Special Autonomy status awarded to Papua in the year 2000. The status of West Irian Jaya province is not yet resolved as of early 2006.

"Papua" is the official Indonesian and internationally recognised name for the province. During the Dutch colonial era the region was known as part of "Dutch New Guinea" or "Netherlands New Guinea". The province was known as "West Irian" or "Irian Barat" from 1969 to 1973, and then renamed "Irian Jaya" (roughly translated, "Glorious Irian") by the Suharto administration. This was the official name until "Papua" was adopted in 2002. Today, natives of this province prefer to call themselves Papuans rather than Irianese. This may be due to etymology (variously identified as a real etymology or a folk etymology) of the name Irian which stems from the acronym Ikut Republik Indonesia, Anti Nederland (join/follow the Republic of Indonesia, rejecting The Netherlands).

The name "West Papua" was adopted in 1961 by the New Guinea Council until the United Nations Temporary Executive Authority (UNTEA) transfer administration to the Republic of Indonesia in 1963. "West Papua" has since been used among Papuan separatists and usually refers to the whole of the Indonesian portion of New Guinea. The other Indonesian province that shares New Guinea, West Irian Jaya, has been officially renamed as "West Papua".
Papua Geography
Dhani's tribes home call honai A central east-west mountain range dominates the geography of New Guinea, over 1600 km in total length. The western section is around 600 km long and 100 km across. The province contains the highest mountains between the Himalayas and the Andes, rising up to 4884 m high, and ensuring a steady supply of rain from the tropical atmosphere. The tree line is around 4000 m elevation and the tallest peaks contain permanent equatorial glaciers, increasingly melting due to a changing climate. Various other smaller mountain ranges occur both north and west of the central ranges. Except in high elevations, most areas possess a warm humid climate throughout the year, with some seasonal variation associated with the northeast monsoon season.

The third major habitat feature are the vast southern and northern lowlands. Stretching for hundreds of kilometers, these include lowland rainforests, extensive wetlands, savanna grasslands, and some of the largest expanses of mangrove forest in the world. The southern lowlands are the site of Lorentz National Park, also a UNESCO World Heritage Site.

The Mamberamo river, sometimes referred to as the "Amazon of Papua" is the province's largest river which winds through the northern part of the province. The result is a large area of lakes and rivers known as the Lakes Plains region. The famous Baliem Valley, home of the Dani people is a tableland 1600 m above sea level in the midst of the central mountain range; Puncak Jaya, sometimes known by its former Dutch name Carstensz Pyramid, is a mist covered limestone mountain peak 4884 m above sea level.