Belus or Belos is a small river in north-western Israel, where according to legend, mentioned by Isidore of Seville in his Etymologiae glass-making was invented.
This river is identified with what is now called the Na'aman River (Hebrew: נחל נעמן), near Acre.
Pliny the Elder (N.H. 5.19), using the name 'Pacida', mentions that the river flowed from Lake Cendevia (now below Mount Carmel) for five miles (8 km) to the sea near "Ptolemais Ace", and that it was celebrated for its vitrous sands.
Today's Na'amân River originates from springs near Ein Afek, primarily Ein Nymphit, and flows through the Zevulun valley to the Acre Bay. The Ein Afek springs originally caused swamps to be formed. These swamps were dried up in the early 1900's, and replaced by a small nature reserve around a small lake.
The Na'amân River is approximately 10 KM long, and flows from south to north, before emptying into the Mediterranean sea.