All ports in Shenzhen, a south China city neighboring Hong Kong, reported a peak as mainland holidaymakers flocked to Hong Kong on Friday, the second day of the Chinese Lunar New Year.

More than 180,000 people from China's mainland crossed the ports in Shenzhen for shopping and sightseeing in Hong Kong as of 6 p.m. on Friday, according to a report released by the Shengzhen border control department.

Travelers from Heilongjiang, Henan, Jiangsu, Sichuan, Hunan and other provinces joined about 5,000 tourist groups to cross the border.

In the week-long New Year holiday, residents from Hong Kong and Macao also rush to the mainland to visit relatives and friends.

By 6 p.m. on Friday, about 220,000 people passed through the ports in Shenzhen to enter the mainland.

Saturday will see an even bigger flow of two-way travelers at the ports in Shenzhen, according to the city's border control department.