Clain Coordinates: 46°46′52″N 0°32′26″E From Wikipedia, the free encyclopedia ClainLocationCountryPhysical characteristicsSource • locationMouth • location • coordinatesLengthBasin sizeBasin featuresProgression France Poitou Vienne 46°46′52″N 0°32′26″E 144 km (89 mi) 3,145 km2 (1,214 sq mi) Vienne→ Loire→ Atlantic Ocean The Clain rivers in Chasseneuil-du-Poitou The Clain (French pronunciation: ..