Lake Wyangan is located 6km north of Griffith. The word Wyangan is an Aboriginal word meaning "turn back home". The Lake Wyangan Catchment lies within the Murrumbidgee (big water) Irrigation Areas and is bounded on three sides by the McPherson Range, forming a basin which drains towards the Lake. Lake Wyangan consists of North and South Lakes which are surrounded by complex of wetlands, namely Tharbogang, Campbells and Nericon. The Lake is considered a manmade Lake in an existing swampy depression. The North and South Lake Wyangan is best considered as two water bodies divided by a public road (Jones Road) that crosses water regulator pipes that gives the option to connect the two Lakes. Lake Wyangan is an endorheic basin, also called a closed or terminal basin. This means that the Lake normally receives and retains water from upstream and surrounding catchment but has no natural outlet to allow outflow to creeks or rivers.
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Satellite images from 1988 shows the Lake colour has been green and it turned to a darker green in recent years.