The Sixian dialect is generally spoken in northern and southern Taiwan, with main representative regions being Taoyuan and Miaoli in the north, as well as the Liudui Region in Kaohsiung and Pingtung in the south.
Taiwanese Hakka is often called Si Hai Yong Le Da Ping An (四海永樂大平安; 四海永乐大平安; Sì Hǎi Yǒng Lè Dà Píng Ān), referring to the Sixian (四縣; 四县), Hailu (海陸; 海陆), Yongding (永定), Changle (長樂; 长乐), Dabu (大埔), Raoping (饒平; 饶平) and Zhao'an (詔安; 诏安) dialects.
Among these, the Sixian and Changle dialects originate in Jiaying Prefecture, Guangdong, established in 1733 during the Qing dynasty under the rule of Yongzheng Emperor.
Alternatively, Sixian may include Xingning and Changle, but because these two counties were formerly a part of Huizhou fu, they may be closer to the Hailu dialect.
In China, the Dabu and Fengshun Counties originally belonging to the Chaozhou fu have been combined with the former Jiaying Prefecture, establishing Meizhou.
However, in Taiwan, speakers of the Dabu and Fengshun dialects are still traditionally considered to be Chaozhou Hakkas.
The Sihai dialect is not a particular accent, but is just formed because of the interaction between different Hakka groups.