The Towerrining Lake and Moodiarrup Swamps Important Bird Area is a 971-hectare (2,400-acre) site comprising a cluster of wetlands on the Blackwood River about 40 kilometres (25 mi) south of Darkan, and 45 kilometres (28 mi) north-west of Kojonup, in the south-west of the Wheatbelt region of Western Australia.

When flooded, the semi-permanent swamp consists of open water with isolated shrubs and stands of dead trees.

The region has a temperate Mediterranean climate with cool, wet winters and warm, dry summers.

[1] The site has been identified as an Important Bird Area (IBA) by BirdLife International because it periodically supports over 1% of the world population of blue-billed ducks.

[2] Other waterbirds recorded using the site in relatively large numbers include Australian shelducks, grey teals and hoary-headed grebes.