The lake is located on Fraser Island (also known as K'gari and Gari) in the Great Sandy National Park.

[4] The lake is known for its reddish brown color, which is caused by colored dissolved organic matter including tannins from tea trees growing in its watershed.

Its inflow comes from two small creeks that pass through wallum swamp, providing the sources of the dissolved matter that creates the unique color.

[5] Lake Boomanjin’s floor is covered in white quartz-rich sands.

There is a campsite on Lake Boomanjin managed as part of the K’gari Recreation Area within Great Sandy National Park.