The field of Constitutional Law is the study of the principles and doctrines laid out in the Constitution of a country. The Philippines has had different constitutions ratified throughout the years with the 1987 Constitution being the latest.
The 1987 Constitutional is separated into 18 articles.
Art. I - National Territory
Article I of the 1987 Constitution provides for the National Territory of the Philippines:
National Territory of the Philippines (Art. 1).
Art. VI - The Legislative Department
Article VI of the 1987 Constitution provides for the powers of the Legislative Department.