Is there a scientifically valid explanation for a circle of islands?

A couple friends and I have started a world called Lothaucan. On this world there is a continent called Novara with a circle of islands as its key feature.

(seen in the mid-left of the image)

Is this feature scientifically and geologically viable? If so, how so? If not, how can we change it for it to be viable?

The world is a moon roughly the size of Earth, orbiting a large Jovian, and has more volcanic and seismic activity than Earth. That is all that has been decided. Please note that I am not asking about the viability of the orbital mechanics, but simply included it so as to give more information. If more information is needed, let me know and I will do my best to get it.

Scale: Novara is a bit bigger than Australia (a little over 3,000,000 square miles/7,770,000 square kilometers).

posted almost 7 years ago

Elvesflame‭

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