Thousand Island Lake

Infobox_lake
lake_name = Thousand Island Lake
image_lake = 1000_Island_Lake_Ansel_Adams_Wilderness.jpg
caption_lake = Banner Peak above the lake
image_bathymetry =
caption_bathymetry =
location = Sierra Nevada, California
coords = Coord|37|43|15|N|119|10|56|W|region:US-CA_type:waterbody
type =
inflow =
outflow = Middle Fork San Joaquin River
catchment =
basin_countries = United States
length = Convert|2.5|mi|km|1|abbr=on
width = Convert|0.7|mi|km|1|abbr=on
area =
depth =
max-depth =
volume =
residence_time =
shore =
elevation = Convert|2997|m|ft|0 [gnis|268247|abbr=on]
islands = many
cities =

Thousand Island Lake is a large alpine lake in California's Sierra Nevada. It is within the boundaries of the Ansel Adams Wilderness, and accessible by either the John Muir Trail, the High Trail, or the River Trail from Agnews Meadow on the road to Devil's Postpile at Mammoth Lakes. The lake also lies along the Sierra High Route.

Thousand Island Lake sits at the base of Banner Peak in the Ritter Range. It is the source of the Middle Fork San Joaquin River, which flows west into the San Joaquin Valley. Ansel Adams made this lake famous with his black and white photographs. The lake is named for the many islands that dot its surface. It was probably named by Theodore S. Solomons, as it appears on his 1896 map; John Muir called it "Islet Lake." [Browning, Peter (1986) "Place Names of the Sierra Nevada." Berkeley: Wildnerness Press. p. 215.]

References