"Somewhere beyond the rainbow."

Translation: Ie preter la ĉielarko.

[FredCapp]

Sialioj* flugas.

The Esperanto word for the species Sialis sialis, the Eastern bluebird. The kind Dorothy would have known.

[vikungen]

Somewheeeeere over the rainboooow

[kiddo-depido]

but it's "over" not "beyond"...