They have already lost her home due to deforestation, often linked to coal mining and palm oil and timber plantations.

Now activists say the great apes could face an even bigger threat as the country builds its new capital on the island of Borneo.

Indonesia is building a new capital called Nusantara on Borneo from scratch -

- relocating it away from the city of Jakarta, and its congestion and pollution.

Construction on Nusantara spans about 640,000 acres - almost four times the size of Singapore.

However, environmentalists fear that it would in turn disturb some of Borneo's wildlife, including dolphins and orangutans.

According to local environment group Pokja Pesisir, nearly a thousand acres of mangrove forests along the coast have already been cleared to make way for a coal port and oil refinery.

Mappaselle, the director of the group, fears more mangrove forests could be razed when a new toll road is built connecting Nusantara to the nearest city of Balikpapan.

"The design for the construction of the capital does not integrate its development planning with the Balikpapan Bay. One of the concerns is that the Balikpapan Bay will become a giant pond for residue waste from the development and activities of the capital upstream. This is our concern."

The Nusantara Capital City Authority said mangroves would be replanted in other areas and guidelines have been made for workers encountering an animal.

Myrna Safitri is the new capital authority's deputy for environment.

"Basically, in the design for building the road, the concern about animals and wildlife is there. But control, every day control needs to be carried out and we will do so."

The government has also promised to protect wildlife and undertake major reforestation in parts of the new capital.

Nusantara has been marketed to investors as a smart and green city.

Foundations are already being laid for government buildings.

Later this year, homes will be built for 16,000 civil servants, military and police officers.

They are due to move in next year.

For now, conservationists hope the government stays true to its pledge to care for animals.

"We hope the government can keep its promise, and the idea of "developing the capital as a green forest city" is not just a slogan. Let's make it happen. At the moment I see it only as talk."