50.338°N -4.791°WParnall's Canal was a half mile long canal that was built in Cornwall in about 1720 near St Austell. It was closed due to a rock slide in about 1732.[1] It was one of only six canals to be built in Cornwall, the others being the St. Columb Canal from Mawgan Porth to St. Columb, the Liskeard & Looe Union Canal, the Par Canal from Pontsmill to Par, the Hayle Canal and the Bude Canal.