Lachsbach

Lachsbach
Location	Saxon Switzerland, Saxony,  Germany
Basin features
Main source	Start: Confluence of the Sebnitz and the Polenz near Porschdorf 142 m above sea level (NHN) 50°56′36″N 14°08′06″E / 50.9432°N 14.1349°E / 50.9432; 14.1349Coordinates: 50°56′36″N 14°08′06″E / 50.9432°N 14.1349°E / 50.9432; 14.1349
River mouth	Near Wendischfähre into the Elbe 127.8 m above sea level (NHN) 50°55′26″N 14°07′48″E / 50.9238°N 14.1299°E / 50.9238; 14.1299
Progression	Elbe → North Sea
River system	Elbe
Basin size	269 km²
Physical characteristics
Length	3.0 km (1.9 mi), with the Polenz 34.3 km (21.3 mi)
Discharge	Location: at Porschdorf I gauge Minimum rate: Average low: 860 l/s Average rate: 3.02 m³/s Maximum rate: Average high: 30.8 m³/s

The Lachsbach, also called the Rathmannsdorfer Bach, is the largest, right-hand tributary of the Elbe in Saxon Switzerland.

The Lachsbach is formed by the merger of its headstreams, the Sebnitz (left, about half the size) and Polenz (right, rather longer) in the Elbe Sandstone Mountains near Porschdorf. The combined confluence section of the two rivers was first recorded in 1543 as die beyde wasser ("the two waters"), a description no longer common today. After only 3 kilometres, the Lachsbach empties into the Elbe above Prossen's winter port near Wendischfähre.

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