I feel like an island in the modern age is probably the easiest target to take depending on the size. Coastline is another issue entirely though.
kharg island is 8 square miles so its pretty small.
in comparison, the smallest state in USA - Rhode Island is 1,500 square miles
supposedly theres 1,000-2,000 iranian troops occupying kharg island
could be more or less. civilian population is something like 10,000 - again could be more or less these are general estimates
they also have a lot of defenses built up there because obviously.
so invasion would be difficult.
island is about 8 miles off the coast of iran so any occupying force (and coalition ships) would be threatened by mainland drone attacks
the US marine expeditionary force has something like 2,000 soldiers.
supposedly you'd probably need about twice that (maybe more) to take the island.
ideally something like 6,000-8,000 troops.. so we dont really have enough.
these could probably be land operations where they go in and fuck shit up and leave but seems risky.
also they will probably be targeted by artillery from the mainland.
granted it will be also risky for iran to fire on their own island, but they dont really have a reason not to if its under invasion
anyways thats what AI tells me lol
