Photo/Illutration Children rejoice over the opening of Zushi beach in Zushi, Kanagawa Prefecture, on June 30. (Asahi Shimbun file photo)

At least 18 people reportedly died in water-related and hiking accidents over the three-day holiday weekend across the nation through July 17.

The extreme heat and record-breaking temperatures in many parts sent many families and friends to cool off at beaches and mountains across Japan. 

A 19-year-old man was found dead on the morning of July 18, trapped between rocks in the Kamanashigawa river, which runs through Nirasaki, Yamanashi Prefecture.

The man apparently fell off a low dam and into the river the previous day, according to police.

A father drowned after trying to rescue his two children on the afternoon of July 16 at a beach in Izumo, Shimane Prefecture.

The 45-year-old man was found floating in the sea approximately 35 meters off the beach and was later confirmed dead.

His 11-year-old daughter and 10-year-old son, who were clinging to their father, were found safe, police said.

Another 10 people, in their 20s to 70s, were killed in water-related accidents in nine prefectures over the weekend, while six people died in mountain-related accidents in four prefectures.

(This article was written by Hikaru Yokoyama and Doni Tani.)