The figure was the highest in more than three weeks, according to an AFP tally of figures released daily by Taiwan's defence ministry.

China insists self-ruled Taiwan is part of its territory, which Taipei rejects.

To press its claims, China deploys fighter jets, drones and warships around Taiwan on a near-daily basis, with the number of sorties increasing in recent years.

In the 24 hours to 6:00 am on Friday (2200 GMT Thursday), Taiwan's defence ministry said it had detected 33 Chinese aircraft and eight navy vessels in its airspace and waters.

That included 19 aircraft that took part in China's "joint combat readiness patrol" on Thursday evening and was the highest number since November 4.

Taiwan also spotted a balloon -- the fourth since Sunday -- about 172 kilometres (107 miles) west of the island.