The song is from the album Nightfall in Middle-Earth, which refers to events that take place a few millenia before the Lord of the Rings. This song in particular is quite probably about one of the two hidden cities of the High Elves ('It lies unknown, this land of mine'), Gondolin being the more likely candidate because Ulmo (the Lord of Water) is mentioned. Other parts of the song fit in with Gondolin as well, such as the chorus: The ruler of Gondolin was warned that his city might fall, but he trusted in his walls rather than in an escape to the sea, which might have saved his people.
The song is from the album Nightfall in Middle-Earth, which refers to events that take place a few millenia before the Lord of the Rings. This song in particular is quite probably about one of the two hidden cities of the High Elves ('It lies unknown, this land of mine'), Gondolin being the more likely candidate because Ulmo (the Lord of Water) is mentioned. Other parts of the song fit in with Gondolin as well, such as the chorus: The ruler of Gondolin was warned that his city might fall, but he trusted in his walls rather than in an escape to the sea, which might have saved his people.