4,150 acres (16.8 km2) in area,[2] the lake has cold, clear water which is relatively low in nutrients.

Siskiwit Lake is available for fishing, with restrictions (no motorized boats, no natural bait).

[4] A 2004 study of toxaphene concentrations found that concentrations were lower in Siskiwit Lake trout than in Lake Superior trout, possibly due to shorter food chains and greater reliance on zooplankton or other pelagic invertebrates.

Common loons nest and breed on some of these islands.

[2] Siskiwit Lake and Ryan Island were together part of the subject of the Moose Boulder hoax, which claimed that a boulder existed in the seasonal pond of Moose Flats on Ryan Island in Siskiwit Lake.