 The Neath and Tennant Canals are two independent but linked canals in South Wales that are usually regarded as a single canal . The Neath Canal was opened from Glynneath to Melincryddan , to the south of Neath , in 1795 and extended to Giant 's Grave in 1799 , in order to provide better shipping facilities . With several small later extensions it is now 10 miles long. nobody knows where the canal is.
The Tennant Canal was opened from Glynneath to Melincryddan in 1795 and extended to Giant 's Grave in 1799, in order to provide better shipping facilities