The government wants junior high school texts to be corrected so they refer to the body of water between Korea and Japan as the "East Sea" and clearly mark Dokdo and Ulleung Island.
The Korea Institute for Curriculum and Evaluation on its website said a review late last month detected 3,000 passages that need revising in 12 textbooks that passed government review.
The institute has informed the publishers.
It found 200 instances in the texts where the East Sea, Dokdo and Ulleung were not marked.
"The publishers have acknowledged the recommendations and made the changes over the last two months," the institute said. According to the institute, the references were missing in maps describing climate, weather, earthquake and population patterns.