The name Txaa K'alii Aksim Lisims is derived from the Nisga'a Creation story depicting the spiritual roots of the Nisga'a to the entire watershed. When Txeemsim (the Nisga'a grandfather of Lisims) created the river Lisims, he walked down from Magoonhl Lisims (where the waters of Lisims starts) to Saxwhl Lisims (the mouth of Lisims). He then turned and looked up at his creation, hence its name [Txaa/ all, entire; K'alii/ upriver; Aks/ water, stream; Lisims/ murky]. The murky appearance is created by the strong force of the flow from the many lakes and streams and rivers that flow into it, especially during the spring thaw or heavy rains.
Source: Nisga'a Tribal Council / Ayuukhl Nisga'a Department, Aiyansh BC