Questions: Eastern European countries that are landlocked have no access to an , causing them to struggle economically.

The answer is "ocean."

Eastern European countries that are landlocked do not have direct access to an ocean. This lack of access can hinder their ability to engage in maritime trade, which is often a significant component of international commerce. Without ports, these countries may face higher transportation costs and logistical challenges, impacting their economic growth.

While some landlocked countries might have access to seas through neighboring countries, the absence of direct access to an ocean is more significant in terms of economic impact. Oceans provide broader trade routes and opportunities for international shipping.

In summary, the lack of access to an ocean is a critical factor affecting the economic struggles of landlocked Eastern European countries.