Eryth Sea (エルト海, Eruyt Sea) is a Field Track in Xenoblade Chronicles, composed and arranged by Manami Kiyota. It is track 20 of disc 3 from the Xenoblade Original Soundtrack. This song is heard during the day while the party is in Eryth Sea.
The Definitive Edition version of this song is reused in Future Connected, where it plays during the day at Soltnar Seal Island on the Bionis' Shoulder.
Motifs from this song are used in "Melia - Ancient Memories" in Xenoblade Chronicles 3.