Overview
The Umbwe route is the shortest and steepest route up Kilimanjaro. It ascends the southern slope. It's the least used trail, which isn't surprising given its poor acclimatization profile. Only about 500 people climb it each year. The summit success rate of this route is very low.
Pros and cons of the Umbwe route
The Umbwe route is a very pretty trail up the mountain and the scenery is varied and very rewarding. Apart from that, however, we don't feel there's much more that's positive to say about this route. This is because it's simply too short to allow for proper acclimatization. And for this reason, it has one of the lowest summit success rates (perhaps the lowest one).
Further to this, the Umbwe is the steepest route up the mountain, so it's physically very demanding. If you're going to spend all of the time and money traveling to Tanzania to climb Kilimanjaro, we highly recommend choosing a longer and gentler route to give yourself the best chance of reaching Uhuru Peak.