The South Nakaizu Area, located at the lower central part of the peninsula, can be summed up in two words: water and lava. The central elevation of the Amagi mountains– an old composite volcanic chain that was active 800,000-200,000 years ago, forms an important geosite. The Amagi area is very popular for numerous seasonal flowers, large tracts of beautiful broadleaf (beech and stewartia) forests which also double up as fall foliage attractions. The Haccho Ike Pond, a low cavity created from rifting is known as the ‘Eye of Amagi.’ Amagi is also a major wasabi horseradish farming location. The mountains can be enjoyed all year round.
The Namesawa Gorge, a smallish gorge carved by the Namesawa River is popular among holidaymakers in summer. This site offers a good example of lava eroded by river flow.
The Joren-no-taki waterfall, created by the lava flowing out of the Hachikuboyama volcano (part of the Izu Tobu Monogenetic Volcanic Chain) 17000 yaers ago, is another major tourist attraction. The columnar joints visible on the rock wall form a beautiful setting for the gushing water.
The Kwagodaira geosite is a remnant of the most explosive eruption event in the history of the Izu Tobu Monogenetic Chain. A huge eruption a pyroclastic surge 3200 years ago formed the landscape of large boulders, rhyolite rocks and this landscape was later populated by trees. The orangish yellow layer of pumice stone and volcanic ash has been located as far away as in the Biwako Lake region in West Japan. This layer is also a popular marker of geological time. The Kawagodaira course is located inside the older Amagi range area, and giant old trees are a major attraction of this trail.