Blue Lake (Tasman)

Rotomairewhenua
Blue Lake
Blue lake
Rotomairewhenua
Location	Tasman Region, South Island
Coordinates	42°3′30.6″S 172°39′25.6″E / 42.058500°S 172.657111°E / -42.058500; 172.657111
Primary inflows	springs[1]
Primary outflows	West Branch of the Sabine River
Basin countries	New Zealand
Surface area	2.45 ha (6.1 acres)[1]
Average depth	7 m (23 ft)[1]
Max. depth	8.5 m (28 ft)[1]
Water volume	180,000 m3 (6,400,000 cu ft)[1]
Residence time	<24 hours[1]
Surface elevation	1,180 m (3,870 ft)[1]

Rotomairewhenua / Blue Lake is a small lake in Nelson Lakes National Park, in the northern reaches of New Zealand's Southern Alps. Sacred to local Māori, it has the clearest natural fresh water in the world.