Saiko
from Eastern end
Location	Yamanashi Prefecture
Coordinates	35°29′54″N 138°41′07″E / 35.49833, 138.68528Coordinates: 35°29′54″N 138°41′07″E / 35.49833, 138.68528
Basin countries	Japan
Surface elevation	901 m

The Saiko (西湖, lit. "West Lake") is one of the Fuji Five Lakes, located in Yamanashi Prefecture, Japan. It is connected to Lake Shoji and Lake Motosu by underground waterways and all three remain the same surface level of 901 metres above sea level.

Note: The West Lake in Hangzhou, China, is written with the same Chinese characters.

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Pictures of Lake Saiko

North-West end of lake Saiko with mount Fuji in backdrop

Lake Saiko from West End

Lake Saiko from West end with mount Fuji in background