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, flows into the river near the scattered settlement of Wilischthal. The winding, increasingly narrow and rocky Zschopau valley is followed by the Annaberg and Buchholz railway to Flöha, which has interesting structural features.