The Heishui Mohe or Heuksu Malgal also called Black-River Mohe (黑水靺鞨; Hangul: 흑수말갈; pinyin: Hēishuǐ Mòhé; Jurchen/manchu: sahaliyan i aiman 薩哈廉部), were the most feared among the Mohe tribes.
Heishui Mohe (Hanja/Hanzi: 黑水靺鞨;; pinyin: Hēishuǐ Mòhé; Hangul: 흑수말갈; RR: Heuksu Malgal) roughly between the north of Hejiang Province (Shuangyashan, Jiamusi, Hegang and Yichun) and the south of actual Khabarovsk Krai (Bikin, Vyazemsky, Lazo and Khabarovsk neighbourhood).
After that, the capital city of Baekje was moved southward from Habuk Wiryeseong because the Malgal were located at the North and Nangnang was located to the East.
Indeed, troubled by an increasingly confrontational Balhae (which had actually launched a seaborne attack against Tang in 733), in 733 the Tang emperor Xuanzong enfeoffed King Seongdeok as Military Commander of Ninghai (Ninghai junshi 寧海軍使) with orders to chastise the Balhae/Malgal state.