sentences:  A few thousand years ago the Suguta was filled by a major lake, but now it is extremely dry and hot, with only the small Lake Logipi at the northern end.Some of the recent cones on the floor of the rift valley and on the eastern side of the rift below the Tirr Tirr Plateau contain hot springs.Namarunu was mainly formed during the upper Pliocene, but has some material from the Holocene.