Green hags are found in desolate swamps and dark forests.
A green hag is about the same height and weight as a female human.

Green hags prefer to attack from hiding, usually after distracting foes. They often use darkvision to their advantage by attacking during moonless nights.
Spell-Like Abilities: At will?dancing lights, disguise self, ghost sound (DC 12), invisibility, pass without trace, tongues, water breathing. Caster level 9th. The save DC is Charisma-based.
Weakness (Su): A green hag can weaken a foe by making a special touch attack. The opponent must succeed on a DC 16 Fortutude save or take 2d4 points of Strength damage. The save DC is Charisma-based.
Mimicry (Ex): A green hag can imitate the sounds of almost any animal found near its lair.
Skills: A green hag has a +8 racial bonus on any Swim check to perform some special action or avoid a hazard. It can always choose to take 10 on a Swim check, even if distracted or endangered. It can use the run action while swimming, provided it swims in a straight line.
SEE WIKIPEDIA ENTRY: Hag

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System Reference Document -> List of Creatures (SRD)