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For other uses, see Hessel (disambiguation).
Versmold-Versmolder Bruch-Neue Hessel Alte Hessel.jpg
Confluence of the Neuer Hessel and the Alter Hessel near the nature reserve of Versmolder Bruch
State North Rhine-Westphalia, Germany
Reference no. DE: 316
Basin features
Main source Source: Northwest of Halle (Westf.) in the Teutoburg Forest
ca. 170 m above sea level (NN)
52°05′30″N 8°21′02″E / 52.09167°N 8.35056°E / 52.09167; 8.35056Coordinates: 52°05′30″N 8°21′02″E / 52.09167°N 8.35056°E / 52.09167; 8.35056
River mouth Warendorf-Einen
ca. 48 m above sea level (NN)
51°58′26″N 7°54′59″E / 51.97389°N 7.91639°E / 51.97389; 7.91639
Progression Ems → North Sea
River system Ems
Basin size 212.528 km² [1]
Physical characteristics
Length 39.337 km [1]
  • Location:
    at Milte
    (4,3 km oberhalb der Mündung, Einzugsgebiet: 204,87 km²)
  • Minimum rate:
    Record low: 0 l/s (in 2005)
    Average low: 304 l/s
  • Average rate:
    2.12 m³/s
  • Maximum rate:
    Average high: 18.4 m³/s
    Record high: 33.6 m³/s (in 1986)

The Hessel is a 40-kilometre-long (25 mi), right tributary of the River Ems in the territory of the North Rhine-Westphalian districts of Gütersloh and Warendorf in northwest Germany.

The river rises northwest of Halle (Westf.) on the Große Egge, crosses the Hermannsweg, flows through the villages of Hesseln and Hörste in Halle borough, then through the borough of Versmold through Oesterweg, continuing through the town of Sassenberg and along the southern edge of Milte in the borough of Warendorf, before emptying into the Ems near Warendorf-Einen.

Tributaries include the Casumer Bach, Bruchbach, Aabach, Poggenfahrtgraben, Sandfortbach, Teichwiese, Wöstenbach, Beckstroth, Arenbecke and the Speckengraben.

The Snake's Head Meadows lie along the Hessel near Sassenberg, one of the few areas in Germany in which this strictly protected wildflower occurs.