There is no such river as the Murray-Darling River. The Murray River and the Darling River are two separate, individual rivers.

Lightning Ridge is not on the Darling River. It is not very far from the Narran River, which is a tributary of the Culgoa, which in turn is a tributary of the Darling. But no, it is not on the Darling River.

There are many creatures that live in the river Darling, such as the creature, that lives in the river Darling. Also, creatures live in the river Darling alongside other creatures that live in the river Darling. I hope that this was helpful.

The river Darling does not have a significant lake.

The Darling River flows into the Murray River at the town of Wentworth.