The Wyong River is a perennial river that is located in the Central Coast region of New South Wales, Australia. The Wyong River rises below Watagan Mountains west of Martinsville, and flows generally south and southeast, joined by three minor tributaries, before reaching its river mouth within Tuggerah Lake, near Tacoma. The river descends 119 metres …The Wyong River is a perennial river that is located in the Central Coast region of New South Wales, Australia. The Wyong River rises below Watagan Mountains west of Martinsville, and flows generally south and southeast, joined by three minor tributaries, before reaching its river mouth within Tuggerah Lake, near Tacoma. The river descends 119 metres over its 57.5-kilometre course.