Bosnians are voting to choose the country's new collective presidency and lawmakers at national, regional and local levels, deciding between long-entrenched nationalist parties and reformists focused on the economy.

Nearly 3.4 million people are eligible to vote in a country facing its worst political crisis since the end of its war in the 1990s, prompted by separatist policies of the Serb leadership and threats of blockades by Bosnian Croats.

Six things to know about Bosnia's election

The polls opened at 7 a.m (0500 GMT) and will close at 7 p.m (1700 GMT). The first official results are expected at midnight, but political parties are expected to come out with their own results around 10 p.m. 

"I expect some changes at least for our youth," said Mubera Sarac, a pensioner arriving at a polling station in Sarajevo. "It does not matter if old or new (politicians) win, they just need to change something in their minds for the sake of our young people."

Bosnia comprises two autonomous regions, the Serb-dominated Serb Republic, and the Federation shared by Bosniaks and Croats, linked by a weak central government. The Federation is further split into 10 cantons. There is also the neutral Brcko district in the north.

Election campaigning by ruling ethnic parties was dominated by hate speech and nationalist rhetoric, focusing rather on themes of protection of national interests and criticism of opponents than on issues such as jobs and soaring inflation.

"Honestly, I don't have high expectations," said Nemanja Ratkovac, casting his ballot in the Serb Republic's de facto capital of Banja Luka. "I think that neither of the (candidates) did much in this election campaign, except (speak) against each other."

A lack of reliable polls has made it difficult to predict the outcome of the vote, but many analysts believe nationalist parties will remain dominant and that the biggest change may come in the Bosnian Muslim, or Bosniak, camp, which is the largest and most politically diverse.

Cover Picture: Bosnian Serb leading opposition candidate, vice president of the centre-right Party of Democratic Progress, Jelena Trivic, speaks to reporters after casting her vote in Banja Luka. Milan Radulovic / AFP