John S Christian Reserve is a free campsite located in the Murray River, Lakes and Coorong region of South Australia, roughly 19 km northwest of Walker Flat and accessible via a 9 km dirt road suitable for all vehicles.

The reserve sits in a quiet, shady valley along a dry creek lined with large river red gums. Campers should be aware that stressed river red gums can drop branches suddenly during prolonged hot and dry conditions.

The reserve offers ample space for tent sites, though space for vehicles is limited and long vehicles may not fit or could block access.

Tracks lead up the surrounding hills, with views overlooking the creek and options to follow a dirt track along an old farm fence.

The reserve was named after John S Christian, who was active in the area during the last century, and in recent years invasive pepper trees have been removed to support recovery of native vegetation. It is noted as an excellent spot to hear kookaburras.