Aswan Dam, Aswan High Dam, High Dam - one of the world's largest dams on the Nile River in southern Egypt

barrier - a structure or object that impedes free movement

Hoover Dam - a large dam on the Colorado River in Nevada

milldam - dam to make a millpond to provide power for a water mill

weir - a low dam built across a stream to raise its level or divert its flow

metric linear unit - a linear unit of distance in metric terms

m, meter, metre - the basic unit of length adopted under the Systeme International d'Unites (approximately 1.094 yards)

hectometer, hectometre, hm - a metric unit of length equal to 100 meters

female - an animal that produces gametes (ova) that can be fertilized by male gametes (spermatozoa)

close up, obturate, occlude, impede, obstruct, jam, block - block passage through; "obstruct the path"