The topic of this book concerns protection of sacred sites in the Arctic. To recognise indigenous customary law means to support indigenous customary protection of such sacred sites. It also implies safeguarding cultural heritage in the Arctic. Both legal pluralism and cultural ecology help us understand indigenous customary laws in the Arctic and why we should recognise them. The aim of this chapter is to explain the relations between cultural ecology and legal pluralism in making a case for the recognition of indigenous customary law in the Arctic. It is not about human rights or international public law. It does not deal with any substantial law. However, the implications of the ideas presented here concern constitutional law, cultural autonomy, political autonomy, international law, and the concept of sovereignty. The ideas refer also to the problem of ethos as the basis of every law and society.