Dear Customer (name blocked for privacy),
Apparently I took your question to mean something totally different than the other specialist posting on this site.
Did you want the longest and highest mountain chain located above sea level or did you want the largest mountain chain that was located as close to sea level as possible?
I took your question to mean the last interpretation. If I've misinterpreted your question, then I'm sorry for wasting your time.
Thanks anyway.
Mic Sayre