The summer camp in Wonsan has a maximum capacity of about 1,200 children.
According to Young Pioneer Tours, which leads tours to the campsite, a 2014 renovation led by North Korea's leader Kim Jong Un increased the Wonsan campsite's capacity to around 1,200 children.
Most kids are North Korean, though some come from Russia, China, and other parts of the world.
Rowan Beard, a tour manager for Young Pioneer Tours, told Business Insider that the camp has previously accepted schoolkids from Russia, China, Thailand, Vietnam, Mongolia, Mexico, and other countries.
A former camper told BI that the North Korean kids are largely segregated from international visitors.
He said they only met briefly on their last day of summer camp.
Some kids went because it seemed like a cheap beach holiday, a former camper says.
Frolov, who went to Songdowon to see North Korea with his own eyes, told BI that many others in his cohort were there for a different reason — a chance to go on a beach vacation for very little money.
The summer camp is heavily subsidized by North Korea, and he said it only costs visiting campers about $300 to $400 for the trip.
It also has a private beach area.
The dorms are supervised, but kids still get up to trouble, one ex-camper says.
Frolov, the former camper, said it was easy for kids to buy alcohol and cigarettes in North Korea.
Though the dorms were supervised, he said that it didn't stop his cohort, most of whom were about 12, from getting blind drunk during their first couple of nights of the camp.
There are relics from North Korea's former leader.
The camp was opened in 1960. Relics, such as a tent visited by Kim Jong Il, are on display.
The camp was set up to foster relations with foreign countries through hosting their children.
Kids sing propaganda songs about the country's former Supreme Leaders, an ex-camper says.
International campers are still expected to partake in patriotic rituals.
Frolov, the former camper, said they had to sing songs in Korean about North Korea's former leaders using Russian-language lyric sheets.
This would take place in a large concert hall called the International Friendship Children's Hall, he said.
He added that they also needed to polish a statue of North Korea's founder.
Another unusual ritual, Frolov said, was being made to polish the statue of Kim Il Sung.
Although it was professionally cleaned weekly, he said, they were expected to polish it for dust to show respect for the country's founder.
There are lots of facilities on the vast campsite.
The vast campsite has many facilities, including amusement park rides, an arcade room, a rock-climbing wall, and an aquarium.
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