FYI- Southern Ergoth is a large island. Lorac sent his people into exile in/on Southern Ergoth under the leadership of Alhana, while he remained behind to attempt to use a dragon orb to stop the invaders.
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Presumably you already know that it's "in + large island" and "on + small island"? in Australia, on Long Island CJ
— CalifJim
Presumably you already know that it's "in + large island" and "on + small island"?
in Australia, on Long Island CJ
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I did not know that so thanks a lot. So for this sentence example, it should be "in" also? Gilthanas and his companions acquired the dragon orb, but on the journey to the Isle of Sancrist, a brief clash with the white dragon Sleet caused their ship to crash (on/in) Southern Ergoth and they were captured by Silvanesti elves.
Important note. The guideline I gave you was for to be in/on (an island). You'll have to see in each case whether the verb is typically used with a different preposition.
The expression is crash onto something or into something. I'd use onto for a ship crashing onto an island. on can substitute for onto if you wish.