Why has Zaroff chosen an island for his sport in "The Most Dangerous Game"?
There are several reasons that an island may best serve General Zaroff for his evil purposes. First, Ship-Trap Island is a remote and "God-forsaken place," generally off the beaten track for most ships. Secondly, being an island, there is little chance to escape, since the waters are probably shark-infested and there is no mention of a nearby isle. But most importantly, Ship-Trap Island has its own built-in advantage for Zaroff. The dangerous reefs and
"... giant rocks with razor edges crouch like a sea monster with wide-open jaws. They can crush a ship as easily as I crush this nut."
Zaroff has installed channel lights "where there's none." By turning the lights on or off, he can lure unsuspecting ships to the waters, shipwrecking the stranded sailors on the island. It is those sailors that he uses for his special kind of hunt.
There are several reasons why Zaroff has chosen Ship-Trap island for his hunting ground. The first, and most obvious, is that it is remote and isolated. Since his actions would be illegal in most countries, doing them in such a remote area, outside any national jurisdiction, means that he won't be caught and jailed or hanged as a murderer, something that would happen if he tried these activities in more civilized areas.
Next, the island is completely self-contained, meaning that his victims cannot refuse to join his game and escape. There is nowhere to which they can run.
Finally, the island is surrounded by dangerous reefs, meaning that he can lure ships onto the reefs with a fake lighthouse, giving him a ready supply of shipwrecked sailors for his perverse game.