[Junsainuma Swamp in Nanae] Water Shield Grows in Freshwater Swamp

Junsainuma Swamp

Junsainuma Swamp (蓴菜沼) is a freshwater swamp in Nanae located in the northern direction of Hakodate city, and the 3rd largest lakes in Onuma Quasi-National Park. The perimeter of the swamp is about 7.3 km, and the maximum water depth is 4.6 m. As its name suggests, the swamp was named after harvesting the water shield. The water shield means "The Junsai" in Japanese. It is located in the western part of National Route 5, walking paths and spring water called Gozensui spring (御膳水) as sightseeing spots are in Junsainuma Swamp Area. But it seems that the spring water is not drinkable. Smelt pond fishing can be enjoyed in a winter. A parking lot, a public restroom and buckwheat noodle restaurant "Gozensui" are built at the site. The buckwheat noodles are popular, too. Admission free. The parking lot is free of charge.

Movie of Smelt Pond Fishing

Onuma Quasi-National Park

Onuma Quasi-National Park (大沼国定公園) is a quasi-national park at the foot of Mt. Komagatake (駒ヶ岳) in the southern part of Hokkaido, and is between Nanae town, Shikabe town and Mori town. Its area is 9,083 ha. The park has been designated as the quasi-national park since 1958, and 2 million tourists come. It consists of the Mt. Komagatake of 1,131 m elevation, an active volcano, Lake Ounma (大沼湖), Lake Konuma (小沼湖), Junsai Swamp (蓴菜沼), and beautiful scneries are highlights. The Onuma Quasi-National Park has been chosen as one of The 3 New Views of Japan (新日本三景) together with Miho-no-Matsubara (三保の松原) in Shizuoka prefecture and Yabakei (耶馬渓) in Oita prefecture since 1915. It is also famous for fall foliage, and has been chosen as one of The 100 Best Fall Foliage Spots in Japan (日本紅葉の名所100選). When the Mt. Komagatake erupted from 50,000 to 30,000 years ago, a river was dammed by flowing mud flood, and those lakes were created. Wetlands have been registered under the Ramsar Convention since 2012, and wild waterfowls such as Goose and Duck rest their wings on the surface of the lake. Read More

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Look of Junsainuma Swamp

Wooden paths and a small gazebo were supposed to be built along the lakeshore, and the Gozensui spring were supposed to gush out at the gazebo. When I visited here, the wooden paths were broken, and entering the wooden paths was prohibited. So I suppose that The Junsainuma may be seen only from the lakeshore near the public restroom.

List of Accommodations

Refer to following websites for the accommodations in the Onuma Park. You can get information regarding online reviews and photos.

Onuma Onsen

Tome-no-Yu(留の湯)	HP	Booking	Jalan	Rakuten
Hakodate-Onuma Prince Hotel(函館大沼 プリンスホテル)	HP	Booking	Jalan	Rakuten

Nanae

Onuma Tsuruga Auberge Epuy(大沼鶴雅オーベルジュ エプイ)	HP	Booking	Jalan	Rakuten
Pension Heine(ペンションハイネ)	HP	Booking	Jalan	Rakuten
Station Hotel Asahiya(ステーションホテル 旭屋)	HP	Booking	Jalan	Rakuten
Minshuku Yukkuri Onuma(民宿ゆっくり大沼)	HP	Booking	Jalan	Rakuten
Granvillage Onuma(グランヴィレッヂ 大沼)	HP	Booking	Jalan	Rakuten
Onuma Nagareyama Ranch Paard Musee(大沼流山牧場 Paard Musee)	HP	Booking	Jalan	Rakuten
Pension Kaza(ペンション 風 KAZA)	HP	Booking	Jalan	Rakuten
Niyama Onsen Hotel(ニヤマ温泉ホテル)	HP	Booking	Jalan	Rakuten
Ryoso Chairoi-Tori(旅荘 茶色い鳥)	HP	Booking	Jalan	Rakuten
Minshuku Kamoiso(民宿 鴨井荘)	HP	Booking	Jalan	Rakuten
Minshuku Fujiya(民宿 藤屋)	Only tel: +81-138-65-8164
Pension Nori Hana(ペンション のり☆はな)	HP	Booking	Jalan	Rakuten
Business Minshuku Hana-no-Yado(ビジネス民宿 華の宿)	HP	Booking	Jalan	Rakuten
Beyond Village(ビヨンドビレッジ)	HP	Booking	Jalan	Rakuten
Higashi-onuma Campsite(東大沼キャンプ場)	HP	Booking	Jalan	Rakuten

Mori

Greenpia Onuma(グリーンピア大沼)	HP	Booking	Jalan	Rakuten
Pension Mori-no-Naka-no-Chisana-Ie(ペンション 森の中の小さな家)	HP	Booking	Jalan	Rakuten
Chappurin-kan(ちゃっぷ林館)	HP	Booking	Jalan	Rakuten
Hokkaido Youth Nature Hall Napal Forest(北海道青少年自然の家（ネイパル森）)	HP	Booking	Jalan	Rakuten
Business Hotel Fresco Mori(ビジネスホテル フレスコ森)	HP	Booking	Jalan	Rakuten
Take-no-Ie Ryokan(竹の家旅館)	HP	Booking	Jalan	Rakuten
Midori Ryokan(みどり旅館)	HP	Booking	Jalan	Rakuten
Minshuku Shiosai(民宿潮騒)	HP	Booking	Jalan	Rakuten
Ryokan Tsubaki(旅館椿)	HP	Booking	Jalan	Rakuten
Kikushui Ryokan(菊水旅館)	HP	Booking	Jalan	Rakuten
Midori and Rock Campsite(みどりとロックの広場)	HP	Booking	Jalan	Rakuten