陸に～ない

陸に～ない is used to describe something that is not on land, often contrasting with what is on land or what happens at sea. It can convey a sense of insufficiency or lack of extent when talking about actions, conditions, or states that cannot occur or be found on land. The nuance is similar to saying that something does not apply or is not present in terrestrial contexts, emphasizing limitations that are tied to being on land or away from shore. This pattern is commonly used in discussions about animals, phenomena, or actions that are restricted to the sea or water, and it can also appear metaphorically to mean that something is not feasible or not found in a terrestrial setting.