Lyric discussion by proposals 

Cover art for Your Rocky Spine lyrics by Great Lake Swimmers

It seems to be one big metaphor for exploring your lover's body like new land. So ridiculously beautiful.

I do believe this song is about either a river or a mountain range. Ive heard other songs from these guys about the saint lawrence river and the thousand islands between the great lakes. Must be the river I think. Its one of the most beautiful places Ive ever seen in my life and Ive been all over north america. Definitely worth writing a song about.

Theres a beautiful canyon the glaciers made through the mountains for the river several million years ago.