The loop starts at the mountain register in Injisuthi camp. The first bit, running to the trail head proper, is on tar road. Just before the bridge over the Njesuthi river the trail starts on the right. Follow along the trail to the Marble Baths/Centenary Hut split. Follow the trail left towards Centenary Hut. The incline is fairly benign till you hit Heartbreak Hill around 8km from the start. The next landmark is Centenary Hut. The hut is hidden from this approach and it is a pleasent surprise to see the hut as you come around the corner.