Twycross Zoo said its new Â£2m Gibbon Forest will help the apes display more natural behaviour and encourage breeding to help save the species.
The zoo has one of the largest gibbon collections in Europe and includes the Northern White-Cheeked Crested species, which is facing possible extinction.
The new design gives the animals enough room to swing for about 30m (98.4 ft).
Updates on this story and more from Leicestershire
Dr Sharon Redrobe, Twycross Zoo's chief executive, said the enclosure, which has a series of pods and islands, will allow "gibbons to be gibbons" and reduce the amount of interaction they have with humans.
"We needed a world class habitat," Ms Redrobe said.
"The space is 10 times as much as they had before and so allows the zoo to keep them in bigger groups.
"They can live into their fifties and, for the first time, we will be able to keep two or three generations together."
She added that the gibbons were overawed by their new surroundings and it took the normally booming Siamang gibbons a week before they started to sing.
55,000
Tonnes of earth moved
8,000 Tonnes of imported stone
2,296 Feet of drainage
4,921 Feet of electric cable
155  Tonnes of steel
The gibbons are integral to the European Association of Zoos and Aquaria (EAZA) breeding programme, designed to keep the captive population viable.
Ms Redrobe said gibbons pair for life but are "slow breeders" and need the best conditions to reproduce.
The apes are endangered in their natural habitat in South East Asia due largely to deforestation.
Gibbon Forest is part of a Â£55m upgrade at the zoo, which will include a modern chimpanzee facility.
The 63-year-old attraction has about 500,000 visitors a year.

3 June 2016 Last updated at 10:28 BST
Many people choose to go to university to learn about subjects they enjoy. They also hope it will help them find better jobs when they leave.
We already know that many more girls than boys go to university when they leave school.
This new research suggests that, already by the age of 13, more girls than boys want to go to university.
A study by the Sutton Trust charity looked at the views of more than 3,000 pupils in England.
At age 13-14, almost 65% of girls said they thought it was very important to go to university, compared with 58% of boys.
Why is there a gender difference? Children have been telling Newsround their opinions.

The England Under-19 international, who has not played a Premier League game for the Gunners, will move to the Estadio da Luz on a five-year deal.
Willock, 19, had been offered a new deal at Arsenal, but his move to Lisbon has been revealed via Benfica's Twitter feed.
Manchester City had also been linked with the attacker, whose contract expires on 1 July.
"I hope I can show what I can do on the pitch. I think we have a great team and we can achieve great things in the future," Willock said on the Benfica website.
Willock had been with Arsenal since 2003 with his younger brother, Joe, remaining in the Gunners youth set-up.
Find all the latest football transfers on our dedicated page.
A "world class" enclosure for endangered gibbons has been unveiled at a zoo in Leicestershire.
[NEXT_CONCEPT]
Teenage girls are more likely than boys to think that going to university is a good idea, new research suggests.
[NEXT_CONCEPT]
Arsenal forward Chris Willock is to join Benfica when his contract expires.