Forward Edge of Battle Area is a military term used by American, British/Commonwealth military forces and other members of the NATO, referring to the front lines in a conflict. The NATO flag NATO 2002 Summit in Prague The North Atlantic Treaty Organisation (NATO), also called the North Atlantic Alliance, the Atlantic Alliance or the Western Alliance, is an international organisation for defence collaboration established in 1949, in support of the North Atlantic Treaty signed in Washington, D.C., on... A front line is a line of confrontation in an armed conflict, most often a war. ...

It is defined as "The foremost limits of a series of areas in which ground combat units are deployed, excluding the areas in which the covering or screening forces are operating, designated to coordinate fire support, the positioning of forces, or the maneuver of units".

Example of usage in military slang: "our patrol did a recce about ten klicks ahead of the FEBA, probing the enemy positions." Military slang, or informal military terms, are colloquial terms used commonly by military personnel —often as abbreviations or derivations of the NATO Phonetic Alphabet, or otherwise incorporating aspects of formal military concepts and terms. ... Reconnaissance is the military term for the active gathering information about an enemy, or other conditions, by physical observation. ...

See also

FLOT (Forward line of own troops), FSCL (Fire support coordination line), military slang Forward Line of Own Troops in military parlance, is the line of a forces forward-most reconnaissance troops. ... Military slang, or informal military terms, are colloquial terms used commonly by military personnel —often as abbreviations or derivations of the NATO Phonetic Alphabet, or otherwise incorporating aspects of formal military concepts and terms. ...

Sources

http://www.dtic.mil/doctrine/jel/doddict/data/f/02204.html

http://www.airpower.maxwell.af.mil/airchronicles/apj/fawcett.html (The first diagram shows an arrangement of FLOT, FEBA, FSCL)