Pounding rain that already caused deadly floods in southern Japan was moving northeast Wednesday, battering large areas of Japan's main island, swelling more rivers, triggering mudslides and destroying houses and roads. At least 58 people have died in several days of flooding.

By Wednesday morning, parts of Nagano and Gifu in central Japan were flooded by massive downpours.

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People look at swollen Hida river following heavy rain in Gero, Gifu prefecture, southern Japan Wednesday, July 8, 2020. Floodwaters flowed down streets in southern Japanese towns hit by heavy rains. (Yuya ShinoKyodo News via AP)

Pounding rain that already caused deadly floods in southern Japan was moving northeast Wednesday, battering large areas of Japan's main island, swelling more rivers, triggering mudslides and destroying houses and roads. At least 58 people have died in several days of flooding.

A damaged road is seen following heavy rain in Hita, Oita prefecture, southern Japan Wednesday, July 8, 2020. Floodwaters flowed down streets in southern Japanese towns hit by heavy rains. (Miyuki SaitoKyodo News via AP)

In a mountainous town of Takayama, several houses were hit by a mudslide, with uprooted trees and other debris scattered around. It was not immediately known what happened to their residents.

A man walks through a flooded road following heavy rain in Omuta, Fukuoka prefecture, southern Japan Tuesday, July 7, 2020. Floodwaters flowed down streets in southern Japanese towns hit by heavy rains. (Juntaro YokoyamaKyodo News via AP)

Though the rains were causing fresh flooding threats in central Japan, flooding was still affecting the southern region. And search and rescue operations continued in Kumamoto, where 14 people are still missing.

A man looks at his parents' house hit by heavy rain in Kuma village, Kumamoto prefecture, southern Japan Wednesday, July 8, 2020. Floodwaters flowed down streets in southern Japanese towns hit by heavy rains. (Kenzaburo FukuharaKyodo News via AP)

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Streets are flooded following a heavy rain in Kurume, Fukuoka prefecture, southern Japan Wednesday, July 8, 2020. Floodwaters flowed down streets in southern Japanese towns hit by heavy rains. (Kyodo News via AP)

Streets are flooded following a heavy rain in Kurume, Fukuoka prefecture, southern Japan Wednesday, July 8, 2020. Floodwaters flowed down streets in southern Japanese towns hit by heavy rains. (Kyodo News via AP)

A vehicle and a tree lie down following a heavy rain in Hita, Oita prefecture, southern Japan Wednesday, July 8, 2020. Floodwaters flowed down streets in southern Japanese towns hit by heavy rains. (Kyodo News via AP)

A vehicle and a tree lie down following a heavy rain in Hita, Oita prefecture, southern Japan Wednesday, July 8, 2020. Floodwaters flowed down streets in southern Japanese towns hit by heavy rains. (Kyodo News via AP)

Footage on NHK television showed swollen water in the Hida River gouging into the embankment, destroying a national highway along the river. In another central Japanese city of Gero, river water rose to just below the bridge above it.

People look at swollen Hida river following heavy rain in Gero, Gifu prefecture, southern Japan Wednesday, July 8, 2020. Floodwaters flowed down streets in southern Japanese towns hit by heavy rains. (Yuya ShinoKyodo News via AP)

People look at swollen Hida river following heavy rain in Gero, Gifu prefecture, southern Japan Wednesday, July 8, 2020. Floodwaters flowed down streets in southern Japanese towns hit by heavy rains. (Yuya ShinoKyodo News via AP)

In a mountainous town of Takayama, several houses were hit by a mudslide, with uprooted trees and other debris scattered around. It was not immediately known what happened to their residents.

Across the country, about 3.6 million people were advised to evacuate, although evacuation is not mandatory and the number of people who actually took shelter was not provided.

As of Wednesday morning, the death toll from the heavy rains starting over the weekend had risen to 58, most of them from the hardest-hit Kumamoto prefecture. Four others were found in Fukuoka, another prefecture on Kyushu, Japan's third-largest island.

A damaged road is seen following heavy rain in Hita, Oita prefecture, southern Japan Wednesday, July 8, 2020. Floodwaters flowed down streets in southern Japanese towns hit by heavy rains. (Miyuki SaitoKyodo News via AP)

A damaged road is seen following heavy rain in Hita, Oita prefecture, southern Japan Wednesday, July 8, 2020. Floodwaters flowed down streets in southern Japanese towns hit by heavy rains. (Miyuki SaitoKyodo News via AP)

Though the rains were causing fresh flooding threats in central Japan, flooding was still affecting the southern region. And search and rescue operations continued in Kumamoto, where 14 people are still missing.

Tens of thousands of army troops, police and other rescue workers mobilized from around the country to assist, and the rescue operations have been hampered by the rains, flooding, mudslides and disrupted communications.

Japan is at high risk of heavy rain in early summer when wet and warm air from the East China Sea flows into a seasonal rain front above the country. In July 2018, more than 200 people, about half of them in Hiroshima, died from heavy rain and flooding in southwestern Japan.

A man walks through a flooded road following heavy rain in Omuta, Fukuoka prefecture, southern Japan Tuesday, July 7, 2020. Floodwaters flowed down streets in southern Japanese towns hit by heavy rains. (Juntaro YokoyamaKyodo News via AP)

A man walks through a flooded road following heavy rain in Omuta, Fukuoka prefecture, southern Japan Tuesday, July 7, 2020. Floodwaters flowed down streets in southern Japanese towns hit by heavy rains. (Juntaro YokoyamaKyodo News via AP)

Follow Mari Yamaguchi on Twitter at https://www.twitter.com/mariyamaguchi

A man looks at his parents' house hit by heavy rain in Kuma village, Kumamoto prefecture, southern Japan Wednesday, July 8, 2020. Floodwaters flowed down streets in southern Japanese towns hit by heavy rains. (Kenzaburo FukuharaKyodo News via AP)

A man looks at his parents' house hit by heavy rain in Kuma village, Kumamoto prefecture, southern Japan Wednesday, July 8, 2020. Floodwaters flowed down streets in southern Japanese towns hit by heavy rains. (Kenzaburo FukuharaKyodo News via AP)

Streets are flooded following a heavy rain in Kurume, Fukuoka prefecture, southern Japan Wednesday, July 8, 2020. Floodwaters flowed down streets in southern Japanese towns hit by heavy rains. (Kyodo News via AP)

Streets are flooded following a heavy rain in Kurume, Fukuoka prefecture, southern Japan Wednesday, July 8, 2020. Floodwaters flowed down streets in southern Japanese towns hit by heavy rains. (Kyodo News via AP)

A vehicle and a tree lie down following a heavy rain in Hita, Oita prefecture, southern Japan Wednesday, July 8, 2020. Floodwaters flowed down streets in southern Japanese towns hit by heavy rains. (Kyodo News via AP)

A vehicle and a tree lie down following a heavy rain in Hita, Oita prefecture, southern Japan Wednesday, July 8, 2020. Floodwaters flowed down streets in southern Japanese towns hit by heavy rains. (Kyodo News via AP)