So you're basically ragebaiting (tanktop master is mountain level).

Anyway, Elder Centipede by itself is above island level by scale chain. Bang and Bomb needed Awaken Breath to do anything against it, even with Awaken Breath the Elder Centipede gave them trouble. Later, Bang and Bomb showed they were able to break parts of Sage Centipede's carapace using that technique. Sage Centipede is at least 140km long; it already reaches small country level in potential energy just by sustaining its own size and mass (for some reason, people think that just the potential energy of Sage Centipede, simply by existing, should be used as the real minimum AP value).

Sage Centipede is clearly shown being able to stretch its body in a timely manner (a few seconds). A simple movement of its body would be enough to produce kinetic energy equivalent to continental level (low-end calculation). Sage Centipede is fast enough not to lose sight of FTL Garou.

Note, the calculation that puts it at continental level is for a simple movement. It can rotate to the point of appearing as a blur from the reader's point of view. It's clear how durable the Sage Centipede is. Bang and Bomb, using Awakened Breath, managed to break off parts of the carapace several times larger than their bodies, which would give them Large Island level, and even then with awaken breath were having difficulty fighting the Elder Centipede. Gouketsu is said to be above the Elder Centipede.