Belize's abundance of terrestrial and marine species and its diversity of ecosystems give it a key place in the globally significant Mesoamerican Biological Corridor. It is considered a Central American and Caribbean nation with strong ties to both the American and Caribbean regions. It is a member of the Caribbean Community (CARICOM), the Community of Latin American and Caribbean States (CELAC), and the Central American Integration System (SICA), the only country to hold full membership in all three regional organizations. Belize is the only mainland Central American country which is a Commonwealth realm, with Queen Elizabeth II as its monarch and head of state, represented by a Governor General (currently, Froyla Tzalam). Belize is considered a tax haven.