In the southwestern part of our study area, two anabranches of Balcanoona Creek debouche onto the floor of Lake Frome, forming a very low gradient radial terminal splay at 2.9 ± 1.2 m.Whereas the northern splay is characterised by an active network of narrow and shallow drainage channels (S1;Suppl. Fig. 1e), no active channel network is developed on the southern half of the splay (S2; Suppl. Fig. 1f).