At least 25,000 hectares on Honshu were confirmed flooded after deadly Typhoon Hagibis devastated 10 prefectures with record-breaking rainfall and strong winds last weekend, the government said.
The flooded areas surpassed the 18,500 hectares logged in last year's torrential rain disaster in western Japan, which killed more than 200 people.
While repair work continues, the country needs to stay cautious as the Meteorological Agency warned Friday of the chance of a secondary disaster striking several areas of the country due to expected heavy downpours over the weekend.