The Woady Yaloak River is a perennial river located in the Western District Lakes region of Victoria, Australia, within the broader Corangamite catchment. Its Aboriginal Wathawurrung name, Wurdi-yaluk, translates to "big creek," reflecting its character as a substantial waterway by local standards.

The river rises below Black Hill, west of Ballarat, at an elevation of approximately 291 metres, and flows generally southward over a meandering course of 104 kilometres, descending 280 metres in total before reaching its mouth at Lake Martin, which in turn connects to Lake Corangamite. Along its course, the river passes through the towns of Smythesdale, Scarsdale, and Cressy, and is joined by three minor tributaries.

The river's meandering nature over a relatively modest gradient suggests a generally low-gradient character through much of its lower reaches, though the upper sections near Ballarat involve more elevation change. The passage through several small towns along its length may offer potential access points for paddlers, though specific put-in and take-out locations, hazard details, and facilities are not well documented. Similarly, details on seasonal water levels, water quality, and any paddling-specific regulations are not readily established.

The river's position within the Corangamite catchment and its terminus at Lake Martin and Lake Corangamite places it within a region of ecological and hydrological significance in Victoria's Western District.