Modder River

{{about|the Modder River||Modder River (disambiguation)}}

{{Use South African English|date=July 2024}}

{{Use dmy dates|date=April 2022}}

{{Infobox river

| name = Modder River

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| name_etymology = Modder meaning 'mud' in Afrikaans

| image = Modder River pontoon bridge.jpg

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| image_caption = Modder River pontoon bridge, 1899

| map =

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| pushpin_map = South Africa

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| pushpin_map_caption= Location of the Modder River mouth

| subdivision_type1 = Country

| subdivision_name1 = South Africa

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| subdivision_type3 = Region

| subdivision_name3 = Free State, Northern Cape

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| mouth = Riet River

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| mouth_coordinates = {{coord|29|2|25|S|24|37|42|E|display=inline,title}}

| mouth_elevation = {{convert|1114|m|abbr=on}}

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The Modder River is a river in South Africa. It is a tributary of the Riet River[http://www.dwaf.gov.za/iwqs/rhp/eco/FROC/WMA13UpperOrange.jpg Upper Orange WMA 13] that forms part of the border between the Northern Cape and the Free State provinces. The river's banks were the scenes of heavy fighting in the beginning of the Second Boer War at the Battle of Modder River.

There is an inhabited farming place named 'Modder River' just north of the confluence between this river and the Riet.[http://plak.co.za/moreinfo.php?id=19564 Modder River - Description]Padlangs deur Suid-Afrika. 2010 {{ISBN|978-1-77007-751-5}}

The Modder River is used extensively for irrigation, including the Krugersdrift Dam near Bloemfontein.