What is the differentence between Mainland and Rimland Middle America?

Mainland Middle America refers to the landlocked countries and regions of Central America, including parts of Mexico and countries like Guatemala, Honduras, and Nicaragua. In contrast, Rimland Middle America encompasses the coastal areas, including the Caribbean islands and coastal regions of Central America, which have significant maritime influence and diverse cultures. The two regions differ in geography, economic activities, and cultural interactions, with Rimland often having more extensive trade and tourism due to its coastal access.