There is a lake in Oregon that disappears every spring. This ephemeral water feature is aptly called Lost Lake, and its peculiar seasonality is due to a rare geological feature called a lava tube.
Lava tubes are formed when lava cools at the surface, but hot lava still flows beneath. When the hot lava drains away, it leaves an empty hole.
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In early spring, the lake fills with water from the snowmelt of the nearby Cascade mountains. This happens faster than the 1.8-meter (6-foot) hole can take it away. In late spring, the lake is suddenly drained and the Lost Lake turns into a peaceful meadow.
You can check out footage of the lake draining below.
