This is the terrifying moment Typhoon Ragasa churned up high waves at a port in the Philippines.

Video shows the rough sea surging toward Port San Vicente as strong winds lashed Cagayan, on September 22.

Residents had taken their boats inland and reinforced their homes ahead of the storm.

Ragasa, locally known as Nando, made landfall in the country's remote and poverty-stricken Babuyan Islands in the province at 3 pm local time on Monday. It arrived as the Philippines continues to grapple with weeks of severe flooding brought on by an unusually intense monsoon season.

The region's low-lying geography, inadequate drainage systems, and rapid urbanisation make it especially vulnerable to flooding.

Limited infrastructure often struggles to handle the heavy rainfall, resulting in widespread flash floods.

State weather bureau PAGASA left the Philippine monitoring zone at 8 am today after temporarily displacing thousands of residents. Authorities said one person was killed and seven were injured in a landslide in Benguet province.

Ragasa was expected to remain in the South China Sea until Wednesday, passing south of Taiwan and Hong Kong before touching down on the Chinese mainland.