Why does the narrator refer to the other bodies of water as "a similar environment"?

the romans were initially interested in expansion via sicily (which at that time was a cultural melting pot), part of which lay under carthaginian control. at the start of the first punic war (264-241 bc), carthage was the dominant power of the western mediterranean, with an extensive maritime empire

the correct answer is the last one accuustomed to millary involvement overseas hope this !

the red river i think.