{{Short description|Group of complex volcanoes on the island of Honshu}} {{More citations needed|date=February 2022}} {{Infobox mountain | name = Mount Nasu | other_name = 那須岳 | image = 20090321MtNasuTagged.jpg | image_size = | image_alt = | image_caption = Nasu Mountains | highest = Sanbonyari Peak | elevation_m = 1916.9 | elevation_ref = <ref name=otm>{{cite opentopomap|Mount Nasu|37.15|139.96144|2023-06-12}}</ref> | prominence_m = 1009 | prominence_ref = <ref>{{Cite web | title=Japanese Archipelago - World Ribus | url=https://worldribus.org/japanese-archipelago/ | access-date=2025-08-30 | website=worldribus.org}}</ref> | range = Ōu Mountains | parent_peak = | listing = Mountains of Japan, Ribu | language = Japanese | pronunciation = | location = On the border of Nasushiohara and Nasu of Tochigi Prefecture, Nishigō, Nishishirakawa of Fukushima Prefecture, Japan | map = Japan | map_alt = | map_caption = | map_size = | label = Mount Nasu | label_position = right | coordinates = {{coord|37|09|N|139|57|E|type:mountain_scale:100000|format=dms|display=inline,title}} | coordinates_ref = | topo = | type = Complex volcano | volcanic_arc = Northeastern Japan Arc | age = | last_eruption = November 1963<ref name=gvp>{{cite gvp|name=Nasudake|vn=283150|access-date=2021-06-24}}</ref> | first_ascent = | easiest_route = | fetchwikidata=ALL }}
{{nihongo|'''Mount Nasu'''|那須岳|Nasu-dake}} is a group of complex volcanoes located in the northeast part of Nikkō National Park, Japan. The tallest peak is Sanbonyari Peak at a height of {{Convert|1916.9|m|ft|0|abbr=on}}. Mount Nasu is one of the 100 Famous Japanese Mountains.
== Major peaks == Mount Nasu has the following major peaks: * Sanbonyari Peak – 1916.9 m * Chausu Peak – 1915 m * Asahi Peak – 1896 m * Minamigatsusan – 1776 m * Kuro-oya Peak – 1589 m
These peaks are known collectively as {{nihongo|'''Nasu Five Peaks'''|那須5岳|Nasu-Go-Take}}.
==Climate== {{Weather box |collapsed = Y |single line = Y |metric first = Y |location = Mount Nasu (1991−2020 normals, extremes 1976−present) |Jan record high C = 12.7 |Feb record high C = 16.8 |Mar record high C = 21.1 |Apr record high C = 26.8 |May record high C = 29.6 |Jun record high C = 30.3 |Jul record high C = 31.8 |Aug record high C = 32.2 |Sep record high C = 29.5 |Oct record high C = 24.6 |Nov record high C = 20.0 |Dec record high C = 17.4 |year record high C = 32.2 |Jan high C = 1.9 |Feb high C = 2.7 |Mar high C = 6.8 |Apr high C = 13.0 |May high C = 18.2 |Jun high C = 20.7 |Jul high C = 24.3 |Aug high C = 25.4 |Sep high C = 21.4 |Oct high C = 16.1 |Nov high C = 10.9 |Dec high C = 5.1 |Jan mean C = −1.7 |Feb mean C = −1.3 |Mar mean C = 2.0 |Apr mean C = 7.8 |May mean C = 13.0 |Jun mean C = 16.4 |Jul mean C = 20.2 |Aug mean C = 21.0 |Sep mean C = 17.3 |Oct mean C = 11.8 |Nov mean C = 6.4 |Dec mean C = 1.1 |Jan low C = -5.3 |Feb low C = -5.3 |Mar low C = -2.4 |Apr low C = 2.6 |May low C = 7.7 |Jun low C = 12.3 |Jul low C = 16.7 |Aug low C = 17.5 |Sep low C = 13.8 |Oct low C = 7.7 |Nov low C = 2.0 |Dec low C = -2.6 |Jan record low C = -11.7 |Feb record low C = -12.1 |Mar record low C = -10.4 |Apr record low C = -6.0 |May record low C = -2.3 |Jun record low C = 3.6 |Jul record low C = 8.7 |Aug record low C = 8.9 |Sep record low C = 3.2 |Oct record low C = -1.2 |Nov record low C = -6.1 |Dec record low C = -10.2 |precipitation colour = green |Jan precipitation mm = 52.6 |Feb precipitation mm = 42.8 |Mar precipitation mm = 101.6 |Apr precipitation mm = 139.6 |May precipitation mm = 180.8 |Jun precipitation mm = 220.5 |Jul precipitation mm = 305.7 |Aug precipitation mm = 303.9 |Sep precipitation mm = 305.3 |Oct precipitation mm = 212.6 |Nov precipitation mm = 89.2 |Dec precipitation mm = 60.1 |snow colour = green |Jan snow cm = 103 |Feb snow cm = 79 |Mar snow cm = 45 |Apr snow cm = 7 |May snow cm = 0 |Jun snow cm = 0 |Jul snow cm = 0 |Aug snow cm = 0 |Sep snow cm = 0 |Oct snow cm = 0 |Nov snow cm = 4 |Dec snow cm = 55 |unit precipitation days = 1.0 mm |Jan precipitation days = 9.1 |Feb precipitation days = 8.3 |Mar precipitation days = 10.4 |Apr precipitation days = 11.3 |May precipitation days = 12.1 |Jun precipitation days = 15.9 |Jul precipitation days = 18.3 |Aug precipitation days = 17.0 |Sep precipitation days = 14.8 |Oct precipitation days = 11.5 |Nov precipitation days = 8.3 |Dec precipitation days = 9.1 |unit snow days = 1 cm |Jan snow days = 11.5 |Feb snow days = 8.8 |Mar snow days = 5.5 |Apr snow days = 0.6 |May snow days = 0 |Jun snow days = 0 |Jul snow days = 0 |Aug snow days = 0 |Sep snow days = 0 |Oct snow days = 0 |Nov snow days = 0.4 |Dec snow days = 5.9 |Jan sun = 131.0 |Feb sun = 129.0 |Mar sun = 156.4 |Apr sun = 170.4 |May sun = 169.1 |Jun sun = 108.8 |Jul sun = 98.7 |Aug sun = 115.3 |Sep sun = 98.9 |Oct sun = 115.1 |Nov sun = 130.1 |Dec sun = 132.6 |year sun = 1555.2 |source 1 = JMA<ref>{{cite web | url = https://www.data.jma.go.jp/obd/stats/etrn/view/rank_a.php?prec_no=41&block_no=0326&year=&month=&day=&view=h0 | script-title=ja:観測史上1～10位の値（年間を通じての値） | publisher = JMA | access-date = February 18, 2022}}</ref> |source 2 = JMA<ref>{{cite web | url = https://www.data.jma.go.jp/obd/stats/etrn/view/nml_amd_ym.php?prec_no=41&block_no=0326&year=&month=&day=&view=h0 | script-title=ja:気象庁 / 平年値（年・月ごとの値） | publisher = JMA | access-date = February 18, 2022}}</ref>}}
== Eruption == It is estimated that Mount Nasu started erupting 600 thousand years ago. The eruption started from the north end of the mountain range, at Kashi-Asahi Peak. Only Chausu Peak is active today.
== Access == * Nasu Sancho Station of Nasu Ropeway * Sandogoya Onsen Bus Stop of Kanto Transportation
==Gallery== <gallery> File:Mt.Chausu&Mt.Asahi.jpg|Chausu lava dome and Asahi Peak File:Nasu chausudake.jpg|Chausu lava dome and fumes File:Nasu asahidake.jpg|Asahi Peak File:Nasudake02.JPG|West view from Sanbonyari Peak File:Nasudake03.JPG|Sanbonyari Peak and snow in summer File:Nasudake08.JPG|At the Sanbonyari Peak File:Nasu Volcano Group Relief Map, SRTM-1.jpg|Topographic map File:Nasudake01.JPG|To Asahi Peak </gallery>
==References== {{reflist}}
== External links == {{commons category|Mount Nasu}} * [https://www.data.jma.go.jp/svd/vois/data/tokyo/301_Nasudake/301_index.html Nasudake] – Japan Meteorological Agency {{in lang|ja}} * {{cite web|url= https://www.data.jma.go.jp/svd/vois/data/tokyo/STOCK/souran_eng/volcanoes/039_nasudake.pdf |title=Nasudake: National catalogue of the active volcanoes in Japan }} – Japan Meteorological Agency * [https://gbank.gsj.jp/volcano/Act_Vol/nasu/index-e.html Nasudake] – Geological Survey of Japan
{{100 Famous Japanese Mountains}}
{{DEFAULTSORT:Nasudake}} Category:Mountains of Tochigi Prefecture Category:Mountains of Fukushima Prefecture Category:Volcanoes of Tochigi Prefecture Category:Volcanoes of Fukushima Prefecture Category:Volcanoes of Honshū Category:Nasu, Tochigi Category:Nasushiobara