Legislators in Indonesia's Aceh province have unanimously approved a law allowing adulterers to be stoned to death.

The regional parliament for the devoutly Muslim province on Monday passed the "qanun jinayat", or sharia law for crimes, also allowing for homosexuality to be punishable by long prison terms and people caught having pre-marital sex to receive 100 strokes with a cane.

Aceh's parliament is the only legislature in Indonesia - the most populous Muslim nation in the world - to employ sharia (Islamic law).

Opponents and supporters of the law, which is to come into effect within 30 days, demonstrated outside parliament on Monday.

All members of the 69-seat house voted for the bill, although some moderate Democrat Party parliamentarians earlier voiced opposition to it.

'Violates international law'

However, the bill has been heavily criticised by human rights groups who have said that stoning people to death violates international conventions to which Indonesia is a signatory.

"There are much more important sharia laws we need, for example against corruption... Why do they only look into peoples private lives"

Destika Gilang Lestari, a human rights activist, said: "There are much more important sharia laws we need, for example against corruption. Why is there no rule against corruption? Why do they only look into peoples private lives?"

The provincial government initially proposed the law, however, it has since said that it rejects some of the bill's clauses and wants to make further revisions.

Mohammad Naza, the province's deputy governor, said that he will do all he can to have the law reviewed.

"We have to synchronize with the situation of the people. Aceh is different than the Middle East," he said.

The law was passed two weeks before a new, more moderate, parliament is to be sworn in, replacing conservative Muslim parties following an election defeat. Some analysts have said that this will lead to the law being toned down.

Step Vaessen, Al Jazeera's correspondent in Banda Aceh, said: "Sharia law has been controversial in Aceh from the start.

"The local leadership doesn’t support it but there is a lot of pressure from Islamic groups. And the people of Aceh are divided and caught in the middle.

"Indonesians are wondering if Aceh has become a testing ground for sharia laws where caning and stoning people to death becomes common practice or whether this most western province will always be the exception to the rest of the country."

Aceh has implemented partial sharia since 2005 with drinking alcohol and gambling already outlawed and headscarves being obligatory for women. Over the last three years people have been caned in public mainly for gambling offences.

Sharia police regularly patrol the cities looking for women who do not cover their heads and unmarried couples socialising at beaches.

Aceh is on the far western tip of the Indonesian archipelago. It is the location where Islam first arrived in Indonesia from Saudi Arabia.

Out of 52 Muslim-majority countries worldwide, stoning is legally sanctioned in varying forms in Afghanistan, Iran, Pakistan, Sudan, Saudi Arabia, the United Arab Emirates and parts of Nigeria.