Between Scharfenstein and Zschopau, its largest left-hand tributary, the Wilisch, flows into the river by the scattered settlement of Wilischthal. The tortuous, increasingly narrow and rocky Zschopau valley is followed by the structurally interesting Annaberg and Buchholz railway to Flöha.
The Wilisch, the largest left-hand tributary between Scharfenstein and Zschopau, merges into the river near the scattered settlement of Wilischthal. The Zschopau valley, which winds through a progressively narrower and more rocky terrain, is followed by the Annaberg and Buchholz railway to Flöha.