At least 10 people died in water accidents across Japan on Sunday, while another person died on a mountain about half way through the summer vacation season, according to a Kyodo News tally.
Eighteen people were injured, including four who are in serious condition, while another person is missing.
The dead included six men aged between 34 and 66 who drowned while swimming in the sea in Tottori, Oita, Shimane, Okinawa and Ibaraki prefectures, and a river in Kochi Prefecture.
A woman died after a personal watercraft crashed into another at Lake Biwa — Japan's largest lake in Shiga Prefecture — and a 44-year-old man died after practicing paragliding on a beach in Miyazaki Prefecture.
The people in serious condition include a 5-year-old girl from Tokyo who was swimming in a pool in Nagano Prefecture and a 5-year-old boy from Kobe who was playing on a beach in Shizuoka Prefecture.
On a mountain in Mie Prefecture, a 50-year-old man tumbled while climbing along a stream and died, police said.