The Light River Delta is a coastal estuary located on the Adelaide Plains, forming part of the Upper Gulf St Vincent Marine Park and designated as a sanctuary zone. This area is one of the most ecologically intact mangrove and saltmarsh systems in South Australia, presenting a relatively undisturbed natural delta landscape. The paddling environment consists of mangrove creeks and intertidal channels, with ebb tide deltaic deposits of sand visible at the mouths of most mangrove creeks, indicating active tidal flow. The surrounding plain features a wide chenier or beach ridge system that has been impacted by off-road recreational vehicles, which may be visible from the water.

As a sanctuary zone within the marine park network, specific regulations are in place to protect the high biodiversity value of this habitat. Paddlers must adhere to all sanctuary zone restrictions, which typically prohibit activities that disturb the environment or wildlife. The area supports significant populations of nationally important shorebirds, with the saltmarshes alone supporting 20 to 29 species. The presence of extensive seagrass beds is also noted. The overall character is that of a pristine and protected coastal wetland, offering a quiet, natural experience focused on observation rather than recreation that impacts the sensitive ecosystem. Given its protected status and ecological sensitivity, paddlers should plan trips with minimal environmental impact in mind, checking current marine park zoning rules for any specific launching or access points.