Searoutes is a professional tool for route and distance calculation voyage planning of seagoing vessels. The dokdo research institute in seoul quotes texts from the 15th century that refer to the islands as korean the dokdo website adds that japanese navy maps from the late 1800s show the islands as . 2 china south korea and japan have long been at loggerheads over these islandsthe diaoyu senkaku islands consist of five islets and three rocks located in the east china sea with a total area . This is a list of the lists of islands in the world grouped by country by continent by body of water and by other classificationsfor rank order lists see the other lists of islands below