1. Mount Wycheproof, Australia: This is often considered the lowest mountain with an elevation of 43 meters (141 feet) above sea level. It's a flat-topped hill in Victoria, Australia.
2. Mount Ararat, Armenia: Mount Ararat is known for its biblical significance, but it's also a very low mountain, with its highest peak, Mount Greater Ararat, reaching 5,137 meters (16,854 feet) above sea level.
3. Mount Everest, Nepal/China: While Mount Everest is the highest mountain on Earth, it's also the lowest mountain from a specific viewpoint! If you stand on the top of Mount Everest, the surrounding mountains are all lower, making them the "lowest mountains" from that perspective.
Ultimately, the answer depends on how you define "mountain" and what criteria you're using.
Let me know if you'd like to explore any of these further!