The canal is 47.2 kilometres ( 29.3 mi ) long .
The canal has two locks , at Hamm and Werries , with a total rise of 6.8 metres ( 22 ft ) .
The canal is 47.2 kilometres ( 29.3 mi ) long and has two locks , at Hamm and Werries , with a total rise of 6.8 metres ( 22 ft ) .