Hokkaidō
is Japan's second largest island and comprises the largest and northernmost prefecture, making up its own region. The Tsugaru Strait separates Hokkaidō from Honshu; the two islands are connected by the undersea railway Seikan Tunnel.
The la ...
,
Japan
Japan ( ja, 日本, or , and formally , ''Nihonkoku'') is an island country in East Asia. It is situated in the northwest Pacific Ocean, and is bordered on the west by the Sea of Japan, while extending from the Sea of Okhotsk in the north ...
. It takes its name from the
Ainu
Ainu or Aynu may refer to:
*Ainu people, an East Asian ethnic group of Japan and the Russian Far East
*Ainu languages, a family of languages
**Ainu language of Hokkaido
**Kuril Ainu language, extinct language of the Kuril Islands
**Sakhalin Ainu la ...
''toputsu'', or 'mouth of the lake'. A saline lagoon divided from the
Sea of Okhotsk
The Sea of Okhotsk ( rus, Охо́тское мо́ре, Ohótskoye móre ; ja, オホーツク海, Ohōtsuku-kai) is a marginal sea of the western Pacific Ocean. It is located between Russia's Kamchatka Peninsula on the east, the Kuril Islands ...
by sand dunes, Lake Tōfutsu provides an important habitat for wintering birds. In 2005 an area of 900 ha of wetlands was designated a
Ramsar Site
A Ramsar site is a wetland site designated to be of international importance under the Ramsar Convention,8 ha (O)
*** Permanent 8 ha (P)
*** Seasonal Intermittent < 8 ha(Ts)
**