Biodiversity loss is one of the biggest challenges of the 21st century. Every day, many species disappear from the Earth's surface which eventually compromise our future. Protected areas are one of the tools used to improve this critical situation. The purpose of this article is to determine whether the instrument of protected areas is a proportionate option to reach the conservation goal, and to analyze whether protected areas do not interfere with one of the fundamental rights, namely the rights of indigenous people. To illustrate the situation, the Chagos Island case, which concerns the British Indian Ocean Territory Marine Protected Area, will be examined in regard to the proportionality principle and the rights of indigenous peoples.