Xhosa name for the Doorn River, now known as; Indwe! It means 'thorns' referring to the Acacia trees that grow in the Area through which the River flows.
Geolocation
27° 22' 4.8", -31° 27' 43.2"
References
New Dictionary of South African Names by Peter E. Raper
Further Reading
https://core.ac.uk/download/pdf/82712356.pdf