Votes are being counted in Sao Tome's presidential election after polls closed on Sunday in a country considered a regional model of democracy.

According to the National Electoral Commission, the voting process was conducted "normally", despite boycotts, especially in the Me-Zochi and Lemba municipalities.

Voting was cancelled in four polling stations on Sunday after residents boycotted the polls demanding better living conditions.

Nineteen candidates are vying to succeed Evaristo Carvalho, president since 2016, who has decided not to stand again.

Nearly 123,000 voters cast their vote to choose the next president of the tiny African island.

Preliminary results are reportedly expected early on Monday.