Voter turnout is high in Zimbabwe’s first general election since long-serving ruler Robert Mugabe was ousted, officials say.
Foreign observers have hailed the election as an opportunity for Zimbabwe to break with its repressive past.
The presidential election is expected to be a tight contest between the incumbent Emmerson Mnangagwa and his main rival Nelson Chamisa.
Parliamentary and local elections are also taking place on Monday.
Opinion polls give Mr Mnangagwa, who heads the ruling Zanu-PF party, a narrow lead over Mr Chamisa, who leads the MDC Alliance. Both leaders are running for the presidency for the first time.
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On Sunday, Mr Mugabe, who first came to power after independence in 1980, said he would not vote for his successor.
Mr Mugabe, regarded as one of the last “Big Men” of African politics, was forced out of office last November by Mr Mnangagwa with the help of the military.
By Pumza Fihlani, BBC News
In Domboshawa village, about an hour’s car ride north of the capital, Harare, many had been in the queue even before sunrise.
The first group of voters were mainly elderly people but there were some youngsters too. A local primary school has been converted into a polling station for the landmark election. Surrounded by mountains and rolling hills, the villagers are in good spirits, chatting and laughing.
But the stakes are high. Zimbabwe’s future is in the balance and nothing is certain. It has been a hotly contested race but there is an air of optimism unlike the nervousness I’ve witnessed covering previous elections here.
“This election is different, there hasn’t been violence. It’s a good sign,” one voter tell me me. After casting his vote, he say his prayer is that whoever wins, puts Zimbabwe first. “We have suffered enough,” he says as as he walks off on to the winding dirt road.
Meet the frontrunners
Emmerson Mnangagwa, Zanu-PF
- Known as “the crocodile” because of his political shrewdness – his party faction is known as “Lacoste”
- Accused of masterminding attacks on opposition supporters after the 2008 election
- Thought to be 75 years old, he promises to deliver jobs, and is seen as open to economic reforms
- Survived several alleged assassination attempts, blamed on supporters of ex-President Mugabe.
Nelson Chamisa, MDC Alliance
- His skull was fractured when beaten up by state security agents in 2007
- Became an MP at 25, a cabinet minister at 31 and could become the youngest president at 40
- A recently qualified pastor, he has been using the hashtag #GodIsInIt for his campaign
- Has promised to rebuild the country’s devastated economy, but has been criticised for making extravagant promises – such as the introduction of a high-speed bullet train and bringing the Olympics to Zimbabwe.