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.

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).

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

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