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.