Castlereagh River
The Castlereagh rises 20 km west of Coonabarabran in the heart of the Warrumbungle mountains at an elevation of about 850 metres. From its commencement upstream in the mountains the river initially flows east through the town of Coonabarabran. It then arcs round south and southwesterly to the village of Ulamambri, then south to Binnaway, and SSW to the small town of Mendooran which lies at the eastern side of the river's hook-shape. From here the Castlereagh flows in a westerly direction at the flattened bottom of the hook and then turns north-westerly towards the town of Gilgandra. From Gilgandra it continues to run northwesterly across the plains through Gulargambone and Coonamble, then continuing across expansive plains, with no urban centres, where elevations are less than 200m, until it joins the Macquarie River at its uppermost reaches beyond the Macquarie Marshes. Its confluence with the Macquarie is about 65 km SW of Walgett. Not far from the Castlereagh/Macquarie confluence the Macquarie itself joins the Barwon River at a place about halfway between Walgett and Brewarrina.
Lord Castlereagh (1802 EIC ship)
EIC voyage #2 (1806–1807): Captain Christopher Kymer acquired a letter of marque on 8 February 1806. He sailed from Portsmouth on 4 March, bound for Madras and Bengal. "Lord Castlereagh" reached Madras on 27 June and arrived at Diamond Harbour on 10 July. She then was at Saugor on 5 September, visited Penang on 17 October, and was back at Kedgeree on 13 December. Homeward bound, she was at Madras on 15 February 1807, Colombo on 20 March, and St Helena on 16 June. She arrived at [{The Downs (ship anchorage)|The Downs]] on 6 September. On 27 February Kymer had written to complain that his surgeon had died and that when the British Royal Navy had impressed his surgeon's mate he no longer had any medical personnel on board.