This pass is well above the national average length at 8.7 km and is one of three back to back passes along the R61 between Lusikisiki and Port St.Johns. There are 58 bends, corners and curves compressed into that length and many of them exceed 90 degrees through tight arcs. It is necessary for drivers to have a high level of concentration on this pass, as it's a busy road and the many courier and delivery trucks and minibus taxis have scant regard for barrier lines.
The pass name is of course taken from the Umzimvubu River which is crossed at the foot of the pass near Port St.Johns. Drivers who do this route for the first time will be in for a few nasty surprises in that here you will find some of South Africa's severest speed bumps. These are unfortunately necessary to slow the wild drivers down - especially near villages and schools. There is one specific speed bump designs which consists of 5 sharp speed bumps, spaced about 1m apart.
Despite all the dangers, the pass offers fabulous scenery and especially towards the middle of the pass where the Gates of St. John start making an appearance. The Xhosa version of the river and pass exclude the U - so "Mzimvubu" For Western tongues having the M and the Z following each other, make it difficult to pronounce. For purposes of indexing we have used the older version of Umzimvubu.