Gydo Pass is situated in the Western Cape, province of South Africa on the Regional road R303 between Ceres and Citrusdal. The Gydo Pass was built at the same time as Michells Pass by Andrew Geddes Bain and his team of convict labourers in, 1848. This important pass connected the Warm Bokkeveld with the higher altitude Koue Bokkeveld, as well as the remote, but fertile (and therefore lucrative) Witzenberg Valley a few kilometers West of the head of the pass.
Geolocation
-33° 14' 2.4", 19° 18' 43.2"
References

https://www.mountainpassessouthafrica.co.za/find-a-pass/western-cape/item/48-gydo-pass,-ceres.html

Further Reading
 
www.sahistory.org.za/.../andrew-geddes-bain-pioneer-sa-geologist-road- engineer-explorer-and-writer-dies-cape-town