The South Pine River is a tidal estuarine waterway in southeast Queensland that joins the North Pine River near Murrumba Downs, not far from the Bruce Highway bridge where the Gateway Arterial connects. The river flows through mangrove-lined banks and is characteristic of tidal estuary paddling, meaning water levels and current direction are governed by the tide rather than rainfall or upstream flow.

The primary access point is Acacia Park on Pine River Road at Murrumba Downs, which features a graveled launch beach. The park sits on the opposite bank from where the South Pine River meets the North Pine River, with Four Mile Creek also located nearby just up the South Pine.

Tidal timing is the most important planning consideration on this river. The recommended window is two hours before and two hours after high tide. At high tide, a paddle of approximately twelve kilometers is possible from Acacia Park upstream to Young's Crossing. Paddlers should be cautious about timing a return trip: if you travel upstream and attempt to return at or near low tide, the river can dry out almost completely, leaving only isolated tidal pools and requiring portaging back to the launch point.

The character of the paddling is quiet and low-key, with the mangrove-lined banks providing a sheltered environment. The area is described as suitable for all types of canoes. Paddlers should be aware that fishing activity occurs on the river, including reports of illegal net use spanning the full width of the waterway, which could present a hazard particularly in low-visibility conditions.