Efrenk River (also called Suntras or Arslanlöy River in the upper reaches and Müftü River in the lower reaches) is a short river in Mersin Province, Turkey. It was originally called Efrenk River. After a mosque named Müftü Mosque was built by the river in Mersin, it was popularly renamed Müftü River.
The drainage basin is only 480 square kilometres in area. But the altitudes of the headwaters are about 1,500 metres. Thus the river flows fast.
