It flows into le Loir, right bank, 1 km north of Bonneval at 129 m high at Ouzenain (locality).

The Ozanne discharge was studied from 1973 to 2014 at Prémoteux, near Trizay-lès-Bonneval at 126 m high, very close to its meeting point with the Loir.

The river has minor seasonal discharge fluctuations, with high waters in winter: mean monthly flow of 2.71 and 3.61 m3/s, from December to March (peak in January) and low waters in summer, end of May to beginning of October, with a mean monthly debit drop of up to 0.235 m3 in August (235 l/s).

However, the 3-day low-water volume can drop to a severe 0.044 m3/s during a dry five-year period (or 44 l/s).

The river Ozanne marks the northern limit of a little ZNIEFF Chenaie-charmaie de la Poupelière.