East Coast Canal and Matai river (Consisting of old Hijli tidal canal, Orissa coast canal and Matai river)
Northern limit Confluence point of Hooghly river and Hijli tidal canal at Geonkhali at Lat 22' 12' 20" N, Lon 88' 03' 07" E.
Southern limit Confluence of Matai river and Dhamra river near Dhamra Fishing harbour at Lat 20' 47' 42" N, Lon 86'53' 03" E.
Brahmani-Kharsua-Dhamra river system(Consisting of Brahmani-Kharsua-Dhamra rivers)
North-Western limit Samal barrage across river Brahmani, Talcher at Lat 21' 04' 26" N, Lon 85' 08' 05" E.
South-Eastern limit An imaginary line drawn across Dhamra river at East Point of Kalibhanj Dian Reserved Forest near Chandnipal at Lat 20' 46' 26" N, Lon 86' 57' 15" E.
Mahanadi delta rivers (Consisting of Hansua river, Nuna nala, Gobri nala, Kharnasi river and Mahanadi river) (Alternate route-Hansua river enters into Bay of Bengal through northern point of False point bay, then enters river Kharnasi at southern end of False point bay, river Atharabanko, a northernly distributory of river Mahanadi)
Northern limit Confluence of Kharsua river with Brahmani river at Ramchandrapur at Lat 20' 36' 55" N, Lon 86' 45' 05" E.
Southern limit An imaginary line in continuation to the Northern break water structure across the entrance channel at Paradip Port at Lat 20' 15' 38" N, Lon 86' 40' 55" E