Kiesselbach area is formed by:

The anteroinferior part or vestibule of the septum contains anastomoses between the septal ramus of the superior labial branch of the facial artery, branch of sphenopalatine artery, and of anterior ethmoidal artery. These form a large capillary network called the Kiesselbach's plexus. This is a common site of bleeding from the nose or epistaxis, and is known a Little's area. (Ref: BD Chaurasia Vol III; ed: 6th Pg: 241)