Legolas stays in Middle Earth for a long time after the end of The Lord of the Rings. First, he travels with Gimli and they explore both Fangorn Forest and the Glittering Caves under Helm's Deep. Then, Legolas founds an elf-colony in Ithilien and worked to restore its forests.
Finally, after Aragorn's death, he built a ship and left Middle Earth, supposedly taking Gimli with him.
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