Slack (river) - Wikipedia

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Slack
The Slack
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Native name	La Slack (French)
Location
Country	France
Physical characteristics

Source
• location	Pas-de-Calais

Mouth
• location	English Channel
• coordinates	50°48′18″N 1°36′5″E / 50.80500°N 1.60139°E / 50.80500; 1.60139
Length	22 km (14 mi)

The Slack (French pronunciation: [slak], in Picard locally [s̟laːk]) is a 22-kilometre-long (14 mi) coastal river in the Pas-de-Calais department, in northern France.^[1]