is a lake in

Mito, Ibaraki is the capital city of Ibaraki Prefecture, in the northern Kantō region of Japan. , the city had an estimated population of 268,036 in 126,055 households and a population density of 1,233 persons per km2. The percentage of the population aged ...

, Japan. The lake is part of Senba Park. It is located next to

Kairaku-en is a Japanese garden located in Mito, Ibaraki Prefecture, Japan. Along with Kenroku-en and Koraku-en, it is considered one of the Three Great Gardens of Japan. Overview Kairaku-en was built in the year 1842 by Tokugawa Nariaki, ''daimyō'' o ...

, a large park built in the

Edo period The , also known as the , is the period between 1600 or 1603 and 1868 in the history of Japan, when the country was under the rule of the Tokugawa shogunate and some 300 regional ''daimyo'', or feudal lords. Emerging from the chaos of the Sengok ...

known for its large number of plum blossoms. The Ibaraki Prefectural Cultural Center is also located nearby, as is the Tokugawa Museum, and Gokoku Shrine. In 1969

Hikone is a city located in Shiga Prefecture, Japan. , the city had an estimated population of 111,958 in 49,066 households and a population density of 570 persons per km². The total area of the city is . Geography Hikone is located in central Shig ...

Shiga Prefecture is a landlocked prefecture of Japan in the Kansai region of Honshu. Shiga Prefecture has a population of 1,398,972 as of 1 February 2025 and has a geographic area of . Shiga Prefecture borders Fukui Prefecture to the north, Gifu Prefecture to th ...

donated a pair of

mute swans The mute swan (''Cygnus olor'') is a species of swan and a member of the waterfowl family Anatidae. It is native to much of Eurasia, and (as a rare winter visitor) the far north of Africa. It is an introduced species in North America, home to ...

and in either 1978 or 1983 two Australian

black swan The black swan (''Cygnus atratus'') is a large Anatidae, waterbird, a species of swan which breeds mainly in the southeast and southwest regions of Australia. Within Australia, the black swan is nomadic, with erratic migration patterns dependent ...

s were donated by Ube in

Yamaguchi Prefecture is a Prefectures of Japan, prefecture of Japan located in the Chūgoku region of Honshu. Yamaguchi Prefecture has a population of 1,377,631 (1 February 2018) and has a geographic area of 6,112 Square kilometre, km2 (2,359 Square mile, sq mi). ...

. In 1987 Mito city donated black swans to

city in

. As of 2019 one of them was still residing in the moat of

Hikone Castle is an Edo-period Japanese castle located in the city of Hikone, Shiga Prefecture, Japan. It is considered the most significant historical site in Shiga. The site has been protected as a National Historic Site since 1951. Hikone is one of only ...

. The lake is home to a large number of wild birds including descendants of the donated swans,

eastern spot-billed duck The eastern spot-billed duck or Chinese spot-billed duck (''Anas zonorhyncha'') is a species of dabbling duck that breeds in Palearctic, East and Southeast Asia. This species was formerly considered a subspecies of the Indian spot-billed duck and ...

little egret The little egret (''Egretta garzetta'') is a species of small heron in the family Ardeidae. It is a white bird with a slender black beak, long black legs and, in the western race, yellow feet. As an aquatic bird, it feeds in shallow water and on ...

intermediate egret The medium egret (''Ardea intermedia''), median egret, smaller egret or intermediate egret, is a medium-sized heron. Some taxonomists put the species in the genus ''Egretta'' or ''Mesophoyx''. It is a resident breeder in southern and eastern As ...

great egret The great egret (''Ardea alba''), also known as the common egret, large egret, great white egret, or great white heron, is a large, widely distributed egret. The four subspecies are found in Asia, Africa, the Americas, and southern Europe. R ...

kingfisher Kingfishers are a family, the Alcedinidae, of small to medium-sized, brightly coloured birds in the order Coraciiformes. They have a cosmopolitan distribution, with most species living in the tropical regions of Africa, Asia, and Oceania, ...

s and more. During the winter

tundra swan The tundra swan (''Cygnus columbianus'') is a small swan of the Holarctic. The two taxa within it are usually regarded as conspecific, but are also sometimes split into two species: Bewick's swan (''Cygnus bewickii'') of the Palaearctic and the w ...

whooper swan The whooper swan ( /ˈhuːpə(ɹ) swɒn/ "hooper swan"; ''Cygnus cygnus''), also known as the common swan, is a large northern hemisphere swan. It is the Eurasian counterpart of the North American trumpeter swan, and the type species for the genu ...

s, Eurasian widgeons,

mallard The mallard () or wild duck (''Anas platyrhynchos'') is a dabbling duck that breeds throughout the temperate and subtropical Americas, Eurasia, and North Africa. It has been introduced to New Zealand, Australia, Peru, Brazil, Uruguay, Arge ...

common coot The Eurasian coot (''Fulica atra''), also known as the common coot, or Australian coot, is a member of the rail and crake bird family, the Rallidae. It is found in Europe, Asia, Australia, New Zealand and parts of North Africa. It has a slaty-bla ...

white wagtail The white wagtail (''Motacilla alba'') is a small passerine bird in the family Motacillidae, which also includes pipits and longclaws. The species breeds in the Palearctic zone in most of Europe and Asia and parts of North Africa; it also has ...

black-headed gull The black-headed gull (''Chroicocephalus ridibundus'') is a small gull that breeds in much of the Palearctic in Europe and Asia, and also locally in smaller numbers in coastal eastern Canada. Most of the population is migratory and winters fu ...

herring gull Herring gull is a common name for several birds in the genus ''Larus'', all formerly treated as a single species. Three species are still combined in some taxonomies: * American herring gull (''Larus smithsonianus'') - North America * European h ...

great crested grebe The great crested grebe (''Podiceps cristatus'') is a member of the grebe family of water birds. The bird is characterised by its distinctive appearance, featuring striking black, orange-brown, and white plumage, and elaborate courtship displa ...

little grebe The little grebe (''Tachybaptus ruficollis''), also known as dabchick, is a member of the grebe family of water birds. The genus name is from Ancient Greek ''takhus'' "fast" and ''bapto'' "to sink under". The specific ''ruficollis'' is from Latin ...

moorhen Moorhens—sometimes called marsh hens—are medium-sized water birds that are members of the rail family (Rallidae). Most species are placed in the genus ''Gallinula'', Latin for "little hen." They are close relatives of coots. They are ...

northern pintail The pintail or northern pintail (''Anas acuta'') is a duck species with wide geographic Range (biology), distribution that breeds in the northern areas of Europe and across the Palearctic and North America. It is bird migration, migratory an ...

pochard Pochard is a common name used for several species of diving ducks: *Four species in the genus ''Aythya'': ** Common pochard, ''Aythya ferina'' ** Baer's pochard, ''Aythya baeri'' ** Ferruginous pochard, ''Aythya nyroca'' ** Madagascar pochard, ' ...

s and other species can be seen. Black swans and mute swans in particular breed near the lake. During the winter of 2016-2017 at least 56 wild birds died of

avian influenza Avian influenza, also known as avian flu or bird flu, is a disease caused by the influenza A virus, which primarily affects birds but can sometimes affect mammals including humans. Wild aquatic birds are the primary host of the influenza A viru ...

. It was reported in 2017 that Mito city was placing decoy eggs in nests near lake Senba to gradually reduce the population over time.

References

{{Authority control Mito, Ibaraki Senba