SEOUL — South Korea remained on alert Sunday as a powerful typhoon, Haishen, has been marching northward amid a forecast that it will soon affect the peninsula directly, Yonhap reported.

The 10th typhoon of the season is expected to reach waters between the southern island of Jeju and the Kyushu region of Japan on Monday morning, according to the Korea Meteorological Administration (KMA).

It's then likely to head north over the East Sea, although it was initially expected to land on the peninsula. Haishen was traveling northward at a speed of 31 kilometers per hour in waters about 200 km south-southwest of Japan's Kagoshima prefecture as of 5 p.m. Sunday, KMA said.

Heavy rains and strong winds are forecast across South Korea throughout Monday, it added.

The state weather agency said the typhoon is likely to reach an area about 310 km east of Seogwipo City on Jeju at 3 a.m. on Monday and waters 80 km east-northeast of South Korea's southeastern port city of Busan at 9 a.m. on the same day.

It is expected to reach waters about 90 km east of Gangneung in Gangwon Province at 3 p.m. on Monday and waters about 120 km south of Chongjin in North Korea at 9 p.m. on the same day.

The Korea Forest Service (KFS) raised the landslide alert to "seriousness," the highest in the four-tier system, for Jeju, Busan, Ulsan and the provinces of South and North Gyeongsang, Gangwon and South Jeolla.

It lifted the alert to "watch" for Seoul and 10 other major cities and provinces. Haishen would be the second typhoon to hit the nation in a week.

Meanwhile, more than 200,000 people have been ordered to evacuate areas of Japan threatened by an approaching storm. Typhoon Haishen is expected to intensify on Sunday, bringing heavy rain, storm surges and winds of more than 100mph (160km/h).

It will move past Kyushu on Sunday and is expected to make landfall on Monday in South Korea, which has raised its typhoon warning to the highest level. It comes days after Maysak, one of the region's strongest typhoons in years.

Haishen has led to the closure of factories, schools and businesses across western Japan. Hundreds of flights and train services have also been canceled.

Japan's government will be holding an emergency Cabinet meeting on Sunday to address the storm.

The country's weather agency said it was not likely to issue its most serious typhoon warning, but added that residents should exercise their "most serious caution" for possible record rains and high waves along the coast.

Yoshihisa Nakamoto, director of the agency's forecast division, told reporters that surging tides may also cause flooding in low-lying areas, particularly around river mouths.

As a result of the storm, hundreds of thousands of people have been advised to move to designated shelters in places like schools and community centers. This includes all 36,600 residents of the city of Goto, in Nagasaki, where the typhoon may hit directly. — Agencies