Polling stations will soon open across Turkey for municipal elections to decide which of the main rival parties will control the country's biggest cities.
Sunday's vote follows last year's parliamentary and presidential elections in which incumbent Recep Tayyip Erdoğan extended his rule after two decades in power.
The poll in Turkey's largest city Istanbul as well as capital Ankara, among other industrial hubs, will be watched closely.
The candidate of the secular Republican People's Party (CHP), current Istanbul Mayor Ekrem Imamoğlu, is seeking to be elected for another five-year term.
In 2019 local elections, Imamoğlu ended the 25-year-long rule by Islamic conservatives in Istanbul.
A second Imamoğlu victory will set him up as a key rival to Erdoğan in the next presidential elections, due in 2028.
Pollsters estimate a close race between Imamoğlu and his rival Murat Kurum, former urban planning minister from Erdoğan`s ruling AKP.
Roughly 61 million people are eligible to vote, including around 1 million first-time voters.