query: How long are the Neath and Tennant Canals?
passage: Neath and Tennant Canal
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 reached its final destination at Briton Ferry. No traffic figures are available, but it was successful, as dividends of 16 per cent were paid on the shares. The canal was 13.5 miles (21.7km) long and included 19 locks.
passage: Neath and Tennant Canal
Encouraged by the recent grant of an Act of Parliament to authorise the building of the Glamorganshire Canal, it was resolved at a meeting at the Ship & Castle public house in Neath on 12 July 1790 to build a canal from Pontneddfechan to Neath, and another from Neath to Giant's Grave. Among those attending was Lord Vernon, who had already built a short canal near Giant's Grave to connect the River Neath to furnaces at Penrhiwtyn. Thomas Dadford was asked to survey a course, and he was assisted by his father and brother. He proposed a route which required 22 locks, part of which was a conventional canal, while other parts used the River Neath. Dadford costed the project at £25,716, but in early 1791 Lord Vernon's agent, Lewis Thomas, proposed two new cuts, and the idea of using the river was dropped soon afterwards.[1]