The Cave Under Zora's Domain can be reached by going through the waterfall at the southwest side of Zora's Domain.
Cave Location
The Cave Under Zora's Domain is located at 3242, 0374, 0078. It can be reached by going through the waterfall at the southwest side of Zora's Domain, a short distance away from Mogawak Shrine.
Cave Features
Just inside the cave, you will find the Chasm Under Zora's Domain.
Beyond that, there is a waterfall that you can swim up if you have the Zora Armor (obtained during the main quest Restoring the Zora Armor), or you can use a hot air balloon or other Zonai devices if you have them. Above the waterfall, you will find this cave's Bubbulfrog on the ceiling.