[3] The river is joined by two minor tributaries before reaching its mouth and emptying into Portland Bay in the Great Australian Bight southeast of Tyrendarra.

[2] One of its tributaries, Darlot Creek, approximately 51 kilometres (32 mi) in length, flows from near Branxholme in a southerly direction through Lake Condah then along the eastern side of the Tyrendarra lava flow before joining the river close to its mouth.

In August 1836 Major Mitchell, who, at the time, was unaware of the presence of the Hentys at Portland Bay named it after FitzRoy Somerset, 1st Baron Raglan when he crossed it near the site of Heywood.

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