British English: The Machine Pond is also locally known as the "Castleknock Pond" that is directly adjacent to Chesterfield Avenue. It is an off-line pond that was formed by diverting water away from a stream to form a stand-alone artificial water body. The culverted Viceregal Stream runs alongside the Machine Pond en route to the Áras Pond and the Dublin Zoo complex, before draining into the River Liffey. The pond has an inflow and outflow on its north-western and south-western shores, respectively. According to park staff, it was used as a depositary for old machinery and other heavy equipment in former times, hence the pond’s name.