Bangkok to Sydney

A nocturnal tarsier with its distinctive large brown eyes, one of the Asian species only found to the west of the Wallace Line, clings to a tree on the island of Sulawesi.

The Sulawesi crested macaque is one of the endemic species found only on the island of Sulawesi, which has not been connected to Borneo by a land bridge for hundreds of millions of years.

A map showing the Wallace Line, which runs off the coast of Borneo between the island and Sulawesi. The Weber and Lydekker Lines are other similar bio-geographical boundaries.

The huge rafflesia flower, up to a metre across and blooming in the wild in Borneo, is one of the many species which only appears west of the Wallace Line and is not present in Australisia.

1908 - A portrait of Alfred Russel Wallace, the British naturalist, explorer, geographer, anthropologist and biologist who proposed the Wallace Line, a natural biogeographic boundary between species.

The imposing Komodo Dragon, found only on a few islands across Indonesia east of the Wallace Line. Their large size is due to few natural predators on the islands.

A red-ring-tailed possum. These marsupials are found only in Australia, Indonesia and Papua New Guinea and exist east of the Wallace Line.

This map of the Earth's tectonic plate boundaries shows a close correlation between the Wallace Line and the boundary between the Eurasian (green) and Australian (orange) plates.

A Sumatran orangutan, found only on the island of Sumatra and not in neighbouring Borneo, is much smaller than its Borneo neighbour - an example of species not crossing water boundaries.

This Bornean Horned Frog blends in perfectly with its surroundings - keeping still on top of a pile of leaves it is barely visible, with the horned ledges over its eyes camouflaging it against predators.

The lush interior of the Central Kalimantan rainforest lies largely untouched, as local tribes understand the importance of living sustainably to preserve it for future generations.

2002 - Haze from fires hangs thick over Borneo and Central Kalimantan. These fires are often as a result of slash-and-burn agriculture, which then burn out of control through forest and drained peatland.

A solitary orangutan on the edge of Sekonyer River, Tanjung Puting National Park, Central Kalimantan, Indonesia. Peat swamp forest holds a crucial role as the endangered orangutan's habitat.

The interior of Central Kalimantan is often hilly and rugged, with impenetrable rainforest stretching across a large proportion of the ground surface. Travel is by air or more usually by canoe or on foot.

Deforestation in Kalimantan to make way for large scale palm oil plantations. A number of schemes have recently been set up to try and halt and manage the destruction of Borneo's rainforest.

A pitcher plant in the Kalimantan forest. These incredible plants grow a pitcher "bowl" to collect water to entice insects to drink, causing them to fall into the water and become food for the plant.

2003 - Palm oil plantations created on land cleared from rainforest in Central Kalimantan. Borneo faces the challenge of balancing economic development and conservation of natural resources.

This ant has been invaded by a parasitic cordyceps fungus, which you can see sprouting up out of the ant's head. The fungus will feed on the living ant until it overcomes it and kills it.

A Bornean orangutan in captivity. Less than 7,000 of these beautiful creatures exist, and all are concentrated in a small community within the jungles of Central Kalimantan.

A juvenile orangutan takes an afternoon nap in the Nyaru Menteng Orangutan Rescue Centre in Central Kalimantan, set up to care for orangutans rescued from degraded land or from the pet trade.

A logging road ploughs its way through pristine Kalimantan rainforest. The area to the left of the image has been disrupted by logging but the area to the right remains untouched.

An adult orangutan with her baby hangs on trees in Camp Leaky, Tanjung Puting National Park, Central Kalimantan, Indonesia.

The Sabangau River and peat swamp forest within the Sabangau National Park, where the world's largest population of orangutans make their home.

An aerial view over tropical peat forest in Central Kalimantan. Trees can grow up to 70 metres high, and more than 900 different species of flowering plants and ferns have been recorded.

2006 - Fires raged across Kalimantan caused by agricultural and land-clearing fires burning out of control. When peat swamp catches fire, it burns with a thick smoke and is difficult to put out.

1905 - "The camp of a Kanyan hunting party". Hunting groups would venture into the forest to hunt small animals such as birds and monkeys using blowpipes and spears.

1905 - Kenyah women husking rice. The grains of rice were separated from their husks by being pounded with a heavy stick. This would allow the outer shell to break and be removed more easily.

A temple assistant replaces a lantern at a Chinese temple in Borneo. Chinese migrants have lived on the island since the 6th century and their influence on local culture is still strong today.

1905 - "Kenyah warfare" - A young hunter arrives back at the village with the spoils from his hunting trip. Food was often communally shared across the longhouse.

1905 - "A Murik" - each tribe within Borneo has a very specific set of traditional dress and customs, which make them easy to distinguish.

1905 - Lirong youths, in simple loincloths which were worn by the majority of men on a day to day basis.

A trader arranges her wares at a colourful Kalimantan street market. Trading has been an important part of Kalimantan culture for centuries.

1905 - A Lirong girl. Earlobe stretching using heavy metal rings is common amongst many tribes, with additional rings added as a woman grows up or after special events.

1905 - "A Kanyan obtaining fire by creating friction between a cane thong and a piece of soft wood." This traditional method of generating fire uses natural materials found in the forest.

A portrait of a Kalimantan trader - the cultural influences of Hakka Chinese immigrants with the style of hat, dress and jewellery are clear in this image.

1905 - Land Dayaks - the Dayak tribes are the most prevalent across Central Kalimantan, and make up the majority of the population.

1905 - Interior of a Kanyan house. Most tribes traditionally lived in large longhouses, which were divided into communal areas and separate areas for each family group.

Early morning trading at a floating market in Kalimantan - traders start work at 5am. Many still use the barter system to exchange goods, part of traditional trading practices for generations.

1905 - A group of Kenyahs villagers outside their longhouse.

1905 - Kenyah carvings: each tribe has its own specific skill in carving, producing elaborate patterns which often have a spiritual or symbolic meaning.

A floating market in Borneo. Trade, both of locally grown produce and also between locals and international traders, has been an important part of Borneo's economy since the 6th century.

1905 - "Interior of a Kadayan house, with a meal laid out in celebration." Dishes were prepared from plants and animals found in the forest, as well as cultivated foods such as rice.