Blendecques is a commune in the Pas-de-Calais department in the Hauts-de-France region in northern France.GeographyA town situated 3 miles south of Saint-Omer, at the junction of the D77, D210 and D211 roads. The river Aa flows through the commune. The town has a football team and a basketball team.Personalities Alfred Machin, filmmaker, was born here.Sights The nineteenth-century church of St. Gilles. The Chapelle de Soyecques. The eighteenth-century Château de La Garenne. Another Château of the 19th century. The abbey of Sainte-Colombe, dating from the twelfth century. The remains of some old watermills and lime-kilns.