A shorter, long lava flow forms the southern lava field, within the upper Kadyr-Os and Khi-Gol valleys. This field with a volume of is comparable to some large Hawaiian lava flows such as the 1950 Mauna Loa lava flow. The Medvedev mound is associated with its own lava flow and peculiar lava features named stony-flowers. This flow has a much smaller volume of , covering a surface of . The youngest lavas were erupted in the upper Khi-Gol valley from the Oka-Jombolok convergence where it assumes an aa morphology. That they don't appear in the intervening region may be because it was channeled through older lava tubes beneath the older lava flows. Lava flows from Jom-Bolok formed a lava dam that generated Lake Khara-Nur about 6,400 years ago.