Assertion: bastion's ditch | /r/HasProperty | linked to the canal saint martin
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text: The ditch that originally linked the defences of the fortress to the River Seine had been dug out at the start of the 19th century to form the industrial harbour of the Bassin de l'Arsenal, linked to the Canal Saint Martin, but is now a marina for pleasure boats, while the Promenade Plantée links the square with redeveloped parklands to the east.