A number of Korean dialects are spoken on the Korean Peninsula. The peninsula is very mountainous and each dialect's "territory" corresponds closely to the natural boundaries between different geographical regions of Korea. Most of the dialects are named for one of the traditional Eight Provinces of Korea. Two are sufficiently distinct from the others to be considered separate languages, the Jeju and the Yukjin languages. Dialect areas [[File:Korean dialect zones (National Atlas of Korea).svg|thumb|upright|Dialect zones in the National Atlas of Korea]] Korea is a mountainous country, and this could be the main reason why Korean is divided into numerous small local dialects. There are few clear demarcations, so dialect classification is necessarily to some extent arbitrary. A common classification, originally introduced by Shinpei Ogura in 1944 and adjusted by later authors, identifies six dialect areas: Hamgyŏng (Northeastern) Spoken in the Hamgyong Province (Kwanbuk and Kwannam) region, the northeast corner of Pyongan Province, and the Ryanggang Province of North Korea as well as Jilin, Heilongjiang of Northeast China; Russia, Uzbekistan, Kazakhstan of former Soviet Union. Nine vowels: the eight of the standard language plus ö. Pyongan (Northwestern) Spoken in Pyongyang, Pyongan Province, Chagang Province, and neighboring Liaoning, of China. The basis of the standard language for North Korea. Central dialects The central dialect refers to a dialect generally used in the surrounding areas of Hwanghae Province, Gangwon Province(Kangwon Province), and Chungcheong Province, centering on Seoul and Gyeonggi Province. Depending on scholars, it is divided into the Gyeonggi dialect(Central dialect) and Chungcheong dialect from the beginning, or subdivided into Gyeonggi dialect, Gangwon dialect, Hwanghae dialect, and Chungcheong dialect. The central dialect region is very large, so it is not easy to extract features common to all regions. Among its characteristics, it is more difficult to extract the unique characteristics of the central dialect. For example, which dialect has an intonation as a phonological list is very important in the dialect compartment. Most of the central dialects do not have intonations, but they have intonations in Yeongdong, Gangwon Province, as well as Pyeongchang, Jeongseon, and Yeongwol, the surrounding Yeongseo regions. In the case of vocabulary, the difference is so severe that we do not know how many pieces the central dialect will be divided into. Therefore, the characteristics of the central dialect, which correspond to all regions of the central dialect region, are extremely rare, and if there is such a feature, it