The Neugrabenflöße (also called the Floßgraben), was a roughly 18 km long Kunstgraben dating to the 17th century.

It enabled the rafting of timber for the mining and smelting industries in the Ore Mountains of eastern Germany.

It ran from the River Flöha near Fleyh (Fláje) to the Freiberger Mulde near Clausnitz in the Ore Mountains.

Starting at Fleyh this artificial water channel ran for about 3.5 km in a northwesterly direction to the eastern end of Bohemian Georgenthal (today Český Jiřetín).

But the Neugrabenflöße was not built until the 17th century to new plans by chief smelting officer (Oberhüttenverwalter), Friedrich Lingke.