Korean dialects
A number of Korean dialects are spoken on the Korean Peninsula. The peninsula is extremely 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. One is sufficiently distinct from the others to be considered a separate language, the Jeju language. Dialect areas. 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: Several linguists have suggested that a further dialect area should be split from the Northeastern dialects: A recent statistical analysis of these dialects suggests that the hierarchical structure within these dialects are highly uncertain, meaning that there is no quantitative evidence to support a family-tree-like relationship among them. Some researchers classify the Korean dialects in Western and Eastern dialects. Compared with Middle Korean, the Western dialects have preserved long vowels, while the Eastern dialects have preserved  tones or pitch accent. The Jeju language and some dialects in North Korean make no distinction between vowel length or tone. But the Southeastern dialect and the Northeastern dialect may not be closely related to each other genealogically. The standard language. Despite North–South differences in the Korean language, the two standards are still broadly intelligible. One notable feature within the divergence is the North's lack of anglicisms and other foreign borrowings due to isolationism and self-reliance—pure/invented Korean words are used in replacement.