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Location Japan, Niigata
Central coordinates 139o 3.00' East  37o 53.00' North
IBA criteria A4i
Area 264 ha
Altitude 0 - 1m
Year of IBA assessment 2004

Wild Bird Society of Japan

Site description Toyanogata is a lagoon of 167 ha in the center of Niigata City. It functions as a flood control basin in Niigata Plain, so it has not been drained for other development purposes, even though it is within city limits. There are reed beds around Toyanogata, and Nuphar japonicum and Trapa japonica grow in the lagoon. In the inlet at the northeastern side of the lagoon, there is another islet which was formed with layers of aquatic plants. There are two parks on the north and south sides of the lagoon, and full-grown trees such as Prunus x yedoensis make a grove. On the south of Toyanogata, there is Seigorogata lagoon. The northwestern part of Seigorogata was reclaimed for a garden. However, reed beds and aquatic plants such as Trapa japonica are found on what remains of Seigorogata lagoon.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Tundra Swan Cygnus columbianus winter  2004  present  A4i  Least Concern 

IBA Monitoring

2010 low not assessed low
Poor - based on little, or potentially unreliable/unrepresentative, data

Transportation and service corridors roads and railroads likely in long term (beyond 4 years) some of area/population (10-49%) no or imperceptible deterioration low

Whole area of site (>90%) covered by appropriate conservation designation  Unknown  Unknown  low 


IUCN habitat Habitat detail Extent (% of site)
Wetlands (inland) Freshwater lakes and pools  -

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Recommended citation  BirdLife International (2015) Important Bird and Biodiversity Area factsheet: Lake Toyanogata. Downloaded from on 29/11/2015

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