The Fountains of Bellagio in Las Vegas are a massive, choreographed water feature situated in an 8-acre man-made lake. Completed in 1998, the system uses over 1,200 'Oarsmen' (robotic water jets) that can spray water as high as 460 feet into the air. The fountain is an engineering marvel of synchronization, utilizing compressed air rather than pumps to propel the water, which allows for near-instantaneous bursts of height and speed timed to music. The network of pipes is over 12 kilometers long and includes 5,000 lights. Despite being in a desert, the water used is recycled 'greywater' from the resort's own facilities, filtered through an on-site treatment plant to minimize environmental impact.