Though lacking the drama of Ngorongoro and Empakaai, Olmoti Crater, 13km north of the Lemala ascent-descent road, is worth visiting on your way north into the highlands. It's also the starting point for a two-day trek to Empakaai. Olmoti's crater floor is shallow, haired with grass and crossed by the Munge River. To reach the rim, it's a one-hour return walk from where the 4WD track ends on the crater's eastern side. From here, a short trail leads to the Munge Waterfall.