[1] Its source is at 150 m (490 ft) near Bommiers,[1] in the Boischaut natural region.

[1] The flow of the river was studied from 1971 to 1975 at Sainte-Lizaigne, located about 10 km (6.2 mi) from its confluence with the Arnon.

From April, the flow rate decreases regularly toward low water, which lasts from August to October.

The daily maximum flow recorded at Sainte-Lizaigne was 32.3 m3/s (1,140 cu ft/s) on March 22, 1974.

The river is rich in bleak, barbel, largemouth bass, cream, pike, crucian, roach, gudgeon, rudd, perch, tench, zander and catfish.