Bali has a specific VFR corridor for sightseeing flights and helicopter tours (e.g., from Tuban to Ubud). The RK PDF maps the mandatory altitude (1,500ft MSL) and the "Silent Zone" over the Ngurah Rai Forest Park.
Recent editions include more than 2,000 solved and unsolved questions to help students practice. Rk Bali Air Navigation Pdf
For the layperson, the PDF looks like a spiderweb of colored lines. Here is a legend: Bali has a specific VFR corridor for sightseeing