Thingvallavatn (thēngˈgvätˌläväˌtən) [key], Icelandic Þingvallavatn, lake, c.35 sq mi (90 sq km), SW Iceland, E of Reykjavík. It is Iceland's largest lake. On its north shore is historic Thingvellir.

The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2012, Columbia University Press. All rights reserved.

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