waterway in Turkmenistan. The main section, begun in 1954 and completed in 1967, runs some 520 miles (840 km) from the Amu Darya (river) to Gökdepe, west of Ashgabat, skirting the Karakum Desert. In the 1970s and '80s the canal was extended to the Caspian Sea coast, making the total length 870 miles (1,400 km). Water from the canal, which is navigable for 280 miles (450 km), is used principally for irrigation, and fishing has been developed on the canal.