Indonesia is a country that embraces legal pluralism regarding customary
law in every indigenous legal community. This means that customary law is
dynamic and constantly interacts with national and international law. Tembawang
Tampun Juah Indigenous Forest, owned by the Ketemenggungan Sisang indigenous
legal community, located in Segumon Hamlet, Lubuk Sabuk Village, Sekayam
District, was designated by the Minister of Environment and Forestry in 2018 based
on outdated legislation. Therefore, based on the retroactive principle, this study
aims to determine the management of the indigenous forest after the establishment
of Tembawang Tampun Juah Indigenous Forest, using normative legal research
methods.The research findings indicate that the management of the indigenous
forest after the establishment of Tembawang Tampun Juah Indigenous Forest is
guided by the Minister of Environment and Forestry Regulation No. 9 of 2021
concerning Social Forestry Management, as well as related regulations regarding
protected forest management and areas with protective functions. This is based on
the retroactive principle stipulated in Article 198, letter b, of the Ministerial
Regulation.One of the challenges in managing the indigenous forest is related to
the preparation and marketing of herbal medicines, which require socialization
among the indigenous legal community, considering that the state has standards
for the preparation and marketing of such medicines.