Mount Nasu

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 1,916.9 m (6,289 ft). Mount Nasu is one of the 100 Famous Japanese Mountains.

Mount Nasu
那須岳
Nasu Mountains
Highest point
Peak	Sanbonyari Peak
Elevation	1,916.9 m (6,289 ft)[1]
Prominence	1,009 m (3,310 ft)[2]
Listing	Mountains of Japan, Ribu
Coordinates	37°09′N 139°57′E
Naming
Language of name	Japanese
Geography
Mount Nasu On the border of Nasushiohara and Nasu of Tochigi Prefecture, Nishigō, Nishishirakawa of Fukushima Prefecture, Japan
Parent range	Ōu Mountains
Geology
Mountain type	Complex volcano
Volcanic arc	Northeastern Japan Arc
Last eruption	November 1963[3]

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 Nasu Five Peaks (那須5岳, Nasu-Go-Take).

Climate

Climate data for Mount Nasu (1991−2020 normals, extremes 1976−present)
Month	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Year
Record high °C (°F)	12.7 (54.9)	16.8 (62.2)	21.1 (70.0)	26.8 (80.2)	29.6 (85.3)	30.3 (86.5)	31.8 (89.2)	32.2 (90.0)	29.5 (85.1)	24.6 (76.3)	20.0 (68.0)	17.4 (63.3)	32.2 (90.0)
Mean daily maximum °C (°F)	1.9 (35.4)	2.7 (36.9)	6.8 (44.2)	13.0 (55.4)	18.2 (64.8)	20.7 (69.3)	24.3 (75.7)	25.4 (77.7)	21.4 (70.5)	16.1 (61.0)	10.9 (51.6)	5.1 (41.2)	13.9 (57.0)
Daily mean °C (°F)	−1.7 (28.9)	−1.3 (29.7)	2.0 (35.6)	7.8 (46.0)	13.0 (55.4)	16.4 (61.5)	20.2 (68.4)	21.0 (69.8)	17.3 (63.1)	11.8 (53.2)	6.4 (43.5)	1.1 (34.0)	9.5 (49.1)
Mean daily minimum °C (°F)	−5.3 (22.5)	−5.3 (22.5)	−2.4 (27.7)	2.6 (36.7)	7.7 (45.9)	12.3 (54.1)	16.7 (62.1)	17.5 (63.5)	13.8 (56.8)	7.7 (45.9)	2.0 (35.6)	−2.6 (27.3)	5.4 (41.7)
Record low °C (°F)	−11.7 (10.9)	−12.1 (10.2)	−10.4 (13.3)	−6.0 (21.2)	−2.3 (27.9)	3.6 (38.5)	8.7 (47.7)	8.9 (48.0)	3.2 (37.8)	−1.2 (29.8)	−6.1 (21.0)	−10.2 (13.6)	−12.1 (10.2)
Average precipitation mm (inches)	52.6 (2.07)	42.8 (1.69)	101.6 (4.00)	139.6 (5.50)	180.8 (7.12)	220.5 (8.68)	305.7 (12.04)	303.9 (11.96)	305.3 (12.02)	212.6 (8.37)	89.2 (3.51)	60.1 (2.37)	2,014.7 (79.33)
Average snowfall cm (inches)	103 (41)	79 (31)	45 (18)	7 (2.8)	0 (0)	0 (0)	0 (0)	0 (0)	0 (0)	0 (0)	4 (1.6)	55 (22)	293 (116.4)
Average precipitation days (≥ 1.0 mm)	9.1	8.3	10.4	11.3	12.1	15.9	18.3	17.0	14.8	11.5	8.3	9.1	146.1
Average snowy days (≥ 1 cm)	11.5	8.8	5.5	0.6	0	0	0	0	0	0	0.4	5.9	32.7
Mean monthly sunshine hours	131.0	129.0	156.4	170.4	169.1	108.8	98.7	115.3	98.9	115.1	130.1	132.6	1,555.2
Source 1: JMA[4]
Source 2: JMA[5]

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

• 
  Chausu lava dome and Asahi Peak
• 
  Chausu lava dome and fumes
• 
  Asahi Peak
• 
  West view from Sanbonyari Peak
• 
  Sanbonyari Peak and snow in summer
• 
  At the Sanbonyari Peak
• 
  Topographic map
• 
  To Asahi Peak