Hong Kong will start to reopen its border with mainland China on Sunday and allow tens of thousands of people to cross from each side every day without quarantine, the city's leader said.

The city's land and sea border checkpoints with the mainland have been largely closed for almost three years under China's "zero-Covid" strategy, which has restricted entry to the country, isolated infected people and locked down areas with outbreaks. The reopening is expected to provide a much-needed boost to Hong Kong's economy.