The Department of the Interior of Costa Rica is a Costa Rican government agency. It is fictional, so its jurisdiction and functions are incompletely known, but assuming it is similar to the U.S. Department of the Interior, its tasks include the management of Costa Rica’s natural resources and protection of its environment. In a 1996 lawsuit against International Genetic Technologies, they also represented the people of Costa Rica; InGen’s negligence had led to numerous injuries and deaths among hired Costa Rican citizens on Isla Nublar, an island owned by Costa Rica. This suggests that the Department is also tasked with enforcing safety regulations.
In real life, the closest analogue to the U.S. Department of the Interior that the Costa Rican government includes is the Ministry of Environment and Energy (Spanish: Ministerio de Ambiente y Energía). Costa Rica uses the term Ministry where the United States would use Department to indicate high-level governmental divisions.