The Clarence is a river in northern France whose course crosses the department of Pas-de-Calais.
Its source is near the village of Sains-lès-Pernes. It flows through the communes of Sachin, Pernes, Calonne-Ricouart, Calonne-sur-la-Lys and Gonnehem, finally joining the Lys near Merville.
It has two tributaries, the Nave and the Grand Nocq.
References
External links (All French language) Banque Hydro - Station E3646210 - La Clarence à Robecq Bassin versant = Informations générales sur les atlas des zones inondables