English words are neither logical nor illogical. The English language, more than most, depends heavily on context to confer meaning. Some English words can mean their own opposite, like “to dust”, “to sanction”, or “to cleave”.
Linguistics aside, even if your country is landlocked you will most likely find a variety of fish in your grocery store, including those from the sea. In fact, the fish in your grocery store most likely traveled less far than many of the fruits and vegetables.