{"id":4931,"date":"2025-11-30T00:13:27","date_gmt":"2025-11-29T15:13:27","guid":{"rendered":"https:\/\/onsen.thmiyake.com\/?p=4931"},"modified":"2026-04-13T21:48:59","modified_gmt":"2026-04-13T12:48:59","slug":"uminokuchi-onsen-izumi-kan","status":"publish","type":"post","link":"https:\/\/onsen.thmiyake.com\/en\/2025\/11\/30\/uminokuchi-onsen-izumi-kan\/","title":{"rendered":"Uminokuchi Onsen &#8211; Yumoto Hotel Izumi-kan"},"content":{"rendered":"\n<p>[Access] About 5 minutes walk from Saku Uminokuchi Station on JR Koumi Line<br>[Webpage]&nbsp;<a href=\"https:\/\/izumikan.com\/\" title=\"\">Yumoto Hotel Izumi-kan<\/a> (Japanese)<\/p>\n\n\n\n<p>After finishing a day hike up Mt. Kobushigatake, I looked around to see if there might be a good hot spring near the trailhead at Moukidaira. Unfortunately, there were no onsen nearby, and even heading down the prefectural road toward Kawakami or Nobeyama didn\u2019t seem very promising. Just as I was starting to give up, I spotted <strong>Uminokuchi Onsen Gensen<\/strong> on Google Maps. It looked amazing\u2014but some posts said it had already become a ruin. Still, on closer inspection, it seemed that a nearby inn called <strong>Izumikan<\/strong> was offering day-use bathing, so I decided to check it out.<\/p>\n\n\n<style>\n.simpleblogcard-template-gridcard-b7008087864d17afc1146dacb808edc4 .card {\n\tborder-right: solid 5px #000080;\n}\n.simpleblogcard-template-gridcard-b7008087864d17afc1146dacb808edc4 .card-image {\n\tgrid-column: 1 \/ span 3;\n\torder: 1;\n}\n.simpleblogcard-template-gridcard-b7008087864d17afc1146dacb808edc4 .card-content {\n\tgrid-column: 4 \/ span 9;\n\torder: 2;\n}\n.simpleblogcard-template-gridcard-b7008087864d17afc1146dacb808edc4 .card-title {\n\tline-height: 80%;\n}\n.simpleblogcard-template-gridcard-b7008087864d17afc1146dacb808edc4 .card-description {\n\tline-height: 80%;\n}\n<\/style>\n<div class=\"simpleblogcard-template-gridcard simpleblogcard-template-gridcard-b7008087864d17afc1146dacb808edc4\">\n\t\t\t<a style=\"text-decoration: none;\" href=\"https:\/\/blog.thmiyake.com\/en\/2025\/11\/30\/mt-kobushi-early-winter-loop\/\">\n\t\t\t<div class=\"card\">\n\t\t\t\t\t\t\t<figure class=\"card-image\">\n\t\t\t\t\t<img decoding=\"async\" data-src=\"https:\/\/blog.thmiyake.com\/wp-content\/uploads\/2025\/12\/PXL_20251129_004033667-scaled.jpg\" alt=\"To Mt. Kobushi in Early Winter \u2013 A Loop Route Connecting the Chikuma River Source, Mt. Sanpo, and Mt. Oyama | \u5b66\u3073\u306e\u304b\u3051\u3089 \u2013 Bits of learnings\" width=\"80\" height=\"60\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" class=\"lazyload\" style=\"--smush-placeholder-width: 80px; --smush-placeholder-aspect-ratio: 80\/60;\" \/>\n\t\t\t\t<\/figure>\n\t\t\t\t\t\t<div class=\"card-content\">\n\t\t\t\t<p class=\"card-host\">blog.thmiyake.com<\/p>\n\t\t\t\t<p class=\"card-title\">To Mt. Kobushi in Early Winter \u2013 A Loop Route Connecting the Chikuma River Source, Mt. Sanpo, and Mt. Oyama | \u5b66\u3073\u306e\u304b\u3051\u3089 \u2013 Bits of learnings<\/p>\n\t\t\t\t\t\t\t\t\t<p class=\"card-description\">\n\t\t\t\t\t\tOn a weekend with good weather, I was planning a hike up Mt. Kobushi, one of Japan&amp;#039;s 100 Famous Mountains, which I&amp;#039;d wanted to climb for a while. The route from M\u014dkidaira on the Naga&#8230;\t\t\t\t\t<\/p>\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t<\/a>\n<\/div>\n\n\n\n<iframe data-src=\"https:\/\/www.google.com\/maps\/embed?pb=!1m18!1m12!1m3!1d25816.062126072713!2d138.4507799148559!3d36.02010376527748!2m3!1f0!2f0!3f0!3m2!1i1024!2i768!4f13.1!3m3!1m2!1s0x601c3c1764b42915%3A0x34e931137676b05!2z5rW344OO5Y-j5rip5rOJ5rqQ5rOJ!5e0!3m2!1sja!2sjp!4v1767019253055!5m2!1sja!2sjp\" width=\"600\" height=\"450\" style=\"border:0;\" allowfullscreen=\"\" referrerpolicy=\"no-referrer-when-downgrade\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" class=\"lazyload\" data-load-mode=\"1\"><\/iframe>\n\n\n\n<p>Just beyond Izumikan, I found the spot shown in the photo above, where hot spring water gushes directly from the source. Mineral deposits clung thickly to the rocks, giving it a wonderfully rustic feel. Judging from the steam, it didn\u2019t seem boiling hot, so I cautiously touched the water\u2014it was pleasantly warm. If only there were a bath using this source water as-is, I thought\u2014it would be perfect.<\/p>\n\n\n\n<p>A little farther past the source, just as Google Maps reviews suggested, stood the remains of an abandoned inn. The atmosphere in the photos was quite appealing, which made it all the more disappointing. With that, I headed back and made my way into Izumikan.<\/p>\n\n\n\n<figure class=\"wp-block-gallery has-nested-images columns-default is-cropped wp-block-gallery-1 is-layout-flex wp-block-gallery-is-layout-flex\">\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"771\" data-id=\"4928\" data-src=\"https:\/\/onsen.thmiyake.com\/wp-content\/uploads\/2025\/11\/PXL_20251129_075745619-1024x771.jpg\" alt=\"\" class=\"wp-image-4928 lazyload\" data-srcset=\"https:\/\/onsen.thmiyake.com\/wp-content\/uploads\/2025\/11\/PXL_20251129_075745619-1024x771.jpg 1024w, https:\/\/onsen.thmiyake.com\/wp-content\/uploads\/2025\/11\/PXL_20251129_075745619-300x226.jpg 300w, https:\/\/onsen.thmiyake.com\/wp-content\/uploads\/2025\/11\/PXL_20251129_075745619-768x578.jpg 768w, https:\/\/onsen.thmiyake.com\/wp-content\/uploads\/2025\/11\/PXL_20251129_075745619-1536x1156.jpg 1536w, https:\/\/onsen.thmiyake.com\/wp-content\/uploads\/2025\/11\/PXL_20251129_075745619-2048x1542.jpg 2048w\" data-sizes=\"(max-width: 1024px) 100vw, 1024px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 1024px; --smush-placeholder-aspect-ratio: 1024\/771;\" \/><\/figure>\n<figcaption class=\"blocks-gallery-caption wp-element-caption\">There were quite a few people who seemed to be locals, and it was fairly lively.<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-gallery has-nested-images columns-default is-cropped wp-block-gallery-2 is-layout-flex wp-block-gallery-is-layout-flex\">\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"771\" data-id=\"4929\" data-src=\"https:\/\/onsen.thmiyake.com\/wp-content\/uploads\/2025\/11\/PXL_20251129_072939921-1024x771.jpg\" alt=\"\" class=\"wp-image-4929 lazyload\" data-srcset=\"https:\/\/onsen.thmiyake.com\/wp-content\/uploads\/2025\/11\/PXL_20251129_072939921-1024x771.jpg 1024w, https:\/\/onsen.thmiyake.com\/wp-content\/uploads\/2025\/11\/PXL_20251129_072939921-300x226.jpg 300w, https:\/\/onsen.thmiyake.com\/wp-content\/uploads\/2025\/11\/PXL_20251129_072939921-768x578.jpg 768w, https:\/\/onsen.thmiyake.com\/wp-content\/uploads\/2025\/11\/PXL_20251129_072939921-1536x1156.jpg 1536w, https:\/\/onsen.thmiyake.com\/wp-content\/uploads\/2025\/11\/PXL_20251129_072939921-2048x1542.jpg 2048w\" data-sizes=\"(max-width: 1024px) 100vw, 1024px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 1024px; --smush-placeholder-aspect-ratio: 1024\/771;\" \/><\/figure>\n<figcaption class=\"blocks-gallery-caption wp-element-caption\">There was a bath with 100% free-flowing hot spring water!<\/figcaption><\/figure>\n\n\n\n<p>Uminokuchi Onsen is classified as a <strong>sodium\u2013magnesium bicarbonate\u2013chloride spring<\/strong>, formerly known as a \u201csalt and bicarbonate spring.\u201d It contains abundant amounts of both salt (chloride ions) and bicarbonate ions, combining the skin-smoothing qualities of bicarbonate springs\u2014often called \u201cbeauty baths\u201d\u2014with the excellent heat-retaining properties of chloride springs. Apparently, this combination is quite rare in Japan.<\/p>\n\n\n\n<p>There is said to be an open-air bath, but on this day it wasn\u2019t available\u2014either it was closed or not accessible for day-use guests\u2014so I enjoyed the indoor baths instead. Inside, there were three tubs: one fed directly by the source, a round bath with hotter water, and another bath that wasn\u2019t filled at the time.<\/p>\n\n\n\n<p>The source-fed bath had a clearly brownish color, while the hotter bath was completely clear. According to the inn\u2019s website, the hotter bath uses diluted source water, but at first glance it almost looked like heated well water or tap water. The inn also promotes the use of \u201cnatural mineral ceramic\u201d materials in the bath, which left me feeling a bit skeptical.<\/p>\n\n\n\n<p>That said, the source bath itself was excellent. With a total mineral content of 3,158 mg\/kg, a pH of 6.8, and a source temperature of 33.5\u00b0C, the water quality and lukewarm temperature were irresistible. The water had a strong metallic scent, and I felt like I could soak forever\u2014it really seemed to work deeply on the body. Strangely enough, though, the local regulars hardly used the source bath at all. Instead, they soaked in the hotter bath, chatting away happily. Maybe that mysterious ceramic bath was the real attraction.<\/p>\n\n\n\n<p>I later realized that the open-air bath apparently has a great atmosphere\u2014I may have simply missed the exit to the outside. What a waste. I also found out afterward that the spring water is drinkable, and that Izumikan even uses it in their tempura batter. It\u2019s a quiet, somewhat rustic inn, but if I ever need a place to stay around Kiyosato or Nobeyama, it\u2019s definitely somewhere I\u2019d like to return to.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>After finishing a day hike up Mt. Kobushigatake, I looked around to see if there might be a good hot spring near the trailhead at Moukidaira. Unfortunately, there were no onsen nearby, and even heading down the prefectural road toward Kawakami or Nobeyama didn\u2019t seem very promising. Just as I was starting to give up, I spotted Uminokuchi Onsen Gensen on Google Maps. It looked amazing\u2014but some posts said it had already become a ruin. Still, on closer inspection, it seemed that a nearby inn called Izumikan was offering day-use bathing, so I decided to check it out.<\/p>\n","protected":false},"author":1,"featured_media":4927,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_locale":"en_US","_original_post":"https:\/\/onsen.thmiyake.com\/?p=4925","footnotes":""},"categories":[7],"tags":[],"class_list":["post-4931","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-chubu","en-US"],"aioseo_notices":[],"_wp_geo_latitude":"36.0207089","_wp_geo_longitude":"138.4893218","_wp_geo_map_settings":[],"_links":{"self":[{"href":"https:\/\/onsen.thmiyake.com\/wp-json\/wp\/v2\/posts\/4931","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/onsen.thmiyake.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/onsen.thmiyake.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/onsen.thmiyake.com\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/onsen.thmiyake.com\/wp-json\/wp\/v2\/comments?post=4931"}],"version-history":[{"count":4,"href":"https:\/\/onsen.thmiyake.com\/wp-json\/wp\/v2\/posts\/4931\/revisions"}],"predecessor-version":[{"id":5423,"href":"https:\/\/onsen.thmiyake.com\/wp-json\/wp\/v2\/posts\/4931\/revisions\/5423"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/onsen.thmiyake.com\/wp-json\/wp\/v2\/media\/4927"}],"wp:attachment":[{"href":"https:\/\/onsen.thmiyake.com\/wp-json\/wp\/v2\/media?parent=4931"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/onsen.thmiyake.com\/wp-json\/wp\/v2\/categories?post=4931"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/onsen.thmiyake.com\/wp-json\/wp\/v2\/tags?post=4931"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}