The search results provided do not contain information about Gahirmatha Beach in Burong Mandi, Bangka Belitung Islands, Indonesia. However, there is a different location named Gahirmatha Beach, which is well-known in Odisha, India, for being the largest olive ridley sea turtle nesting site. It is a protected area within the Gahirmatha Marine Sanctuary. Since the search results are about a different location, more specific information about Gahirmatha Beach in Indonesia cannot be provided.
If referring to the Indian location, Gahirmatha Beach in Odisha is a wildlife sanctuary that shields these turtles from harm and preserves their habitat. The beach separates the Bhitarkanika Mangroves from the Bay of Bengal.