Zainichi Korean language is a language or a dialect spoken by Zainichi Koreans (ethnic Korean citizens or residents of Japan). The speech is based on the southern dialects of Korean, as the majority of first-generation immigrants came from the southern part of the peninsula, including Gyeonggi-do, Jeolla-do, and Jeju-do. Due to isolation from other Korean speech-communities and the influence of Japanese, Zainichi Korean language exhibits strong differences from the standard Korean of either North or South Korea.