Bimmah Sinkhole, also known as Hawiyat Najm, is a natural wonder located in the Al Sharqiyah region of Oman. It is a stunning limestone crater that has been formed due to the collapse of the surface layer of the earth. The sinkhole is filled with crystal-clear turquoise water and is surrounded by limestone cliffs, making it a popular spot for swimming and diving.

Bimmah Sinkhole is about 20 meters deep and 50 meters in diameter. The water is believed to have therapeutic properties due to its high mineral content, and visitors often take a dip in the water to cool off from the hot desert sun.

The sinkhole is located about 600 meters from the main road and is easily accessible via a well-maintained path. There are also picnic tables and shaded areas available for visitors to relax and enjoy the natural beauty of the area.

Bimmah Sinkhole is a popular tourist destination and attracts visitors from all over the world who come to experience the unique beauty of this natural wonder. It is also an important site for research, as the geological features of the sinkhole provide insight into the earth's natural processes.