1) Nature reserve in Serbia 
The Jerma (Serbian Cyrillic: Јерма) or Erma (Bulgarian: Ерма) is a river in southeastern Serbia and western Bulgaria. Even though not very long (74 km), it is notable for passing the Serbian-Bulgarian border twice. == Course == === Serbia === The Jerma originates in the undeveloped and sparsely populated area of Krajište, in the southeas...