PRC 37 SMI Rota da Água - Janela do Inferno is a hiking trail in the Azores, Portugal that offers stunning views and a challenging yet rewarding experience. The trail takes you through lush landscapes, waterfalls, and even a natural rock formation known as "Janela do Inferno" (Window of Hell). It's a must-visit for nature lovers and adventure seekers looking to explore the beauty of the Azores on foot.

For more details about the trail, visit the official Visit Azores website. You can download the GPS track here(I use the Wikiloc app to open and navigate GPX files) and explore a detailed brochure with a hiking map here.