As far as scenic beauty goes, this pass is below average for the Wild Coast. That does not in any way detract from the other interesting information connected with the pass and the area. The De Villiers Bridge at the lowest point on the pass withstood an impressive flood level of over 10m during the 1970 flood, where its safety railings were bent horizontal by the raging floodwaters. It is still like that today.
The pass has an inverted vertical profile with the lowest point being in the middle of the pass at the crossing of the Kobonqaba River. The pass is 8.2 km long and displays an altitude variance of 195m with the steepest gradients reaching 1:8 on the western side. The Kentani area was the scene of several historical skirmishes between the British and the Xhosa during the 9th Frontier War,
The town of Kentani is often in the news around initiation schools and dubious medical standards with a number of initiates losing their lives each year.
There are three back to back passes between Tombo and Port St Johns. They are, from west to east Mngazi River Pass, Butyabuse Pass and the Isinuka Poort. At 7 km it's well above the national average and displays a moderate altitude variance of 138m. It connects the valleys of the Mngazi and Umzimvubu Rivers on the R61..
The pass is modern and well designed, but the local authorities have had to install several traffic calmers (speed bumps) to slow the taxis down, as the pass traverses several villages on its way to the coast. It offers good views of the Mngazi River and towards the middle of the pass the road passes through the villages of Mkanzini, Zitshece and Ndwalane.
There are a number of cautionaries for this road - Pedestrians and especially school children, dogs, livestock, slow and fast moving vehicles, speed bumps, school buses and minibus taxis. Drive with care.
This attractive poort forms the final part of the R61 between Mthatha and Port St. Johns. It is a typical poort following the course of the Umzimvubu River on it's southern bank. Near the western start lies the village of Isinuka after which the poort is named. There is a deep cutting just after the western start as the road slices through the mountain to reach the Umzimubu River Valley.
There are sections of very steep cuttings that tower some 60m above the road, but other than that the road is straight-forward, which is a relative term, as several dangers lurk along this stretch of roadway. Local traffic officers love doing laser speed traps here, where the speed limit jumps several times between 60 and 80 kph. There are also a number of poorly concealed and sharp speed bumps, which require a reduction of speed to 30 kph or lower, Dogs and livestock can appear out of the dense bush without warning and pedestrians tend to wander along the roadway as there is nowhere else for them to walk and of course, last but not least, are the numerous minibus taxis which ply this route and congregate in numbers towards the eastern end of the poort adjacent to the Pondoland Bridge.
The wide and sluggish Umzimvubu River welcomes drivers as it drifts lazily towards the estuary at Port St. Johns' 1st Beach.
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.
This very steep and winding road starts in the town of Port St Johns and winds its way up the lush mountainside, eventually curling back on itself to terminate at the old runway on the top of the mountain. The road is tarred or concreted all the way, so traction is good (even in wet weather) making this drive possible in any vehicle.
The 9.8 km long road has 69 bends, corners and curves to contend with and some fairly steep gradients of 1:5. The views from the end of the airstrip are superb and include a bird's eye view over the Umzimvubu River, the Gates of St John as well as the river mouth itself.
The road was well built many years ago making extensive use of concrete to ensure it would not suffer water damage from the heavy rains that fall in this area. The road has a false summit of 240m ASL which is reached at the 2.8 km mark, where after it undulates and descends until the 5.4 km mark. From this point the gradient ramps up steeply as the road reaches its maximum gradient of 1:6 before reaching the top of the mountain, where you can drive along the tarred runway to the various lookout points.
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