Valmiki Ramayana Kishkindha Kanda Sarga 13 Shloka 18

अत्र here, संश्रितव्रताः strict followers of austere practices, नियतम् highly disciplined, अधःशीर्षाः with head down, जलशायिनः immersed in water, सप्तजनाः नाम called seven ascetics (Saptajana), सप्तैव all the seven, मुनयः ascetics, आसन् were residing.