The Nitinat Lake - SE showing is situated on the southeast shore of Nitinat Lake near its outlet to the Pacific Ocean, 33 kilometres northwest of Port Renfrew.

The showing is comprised of two masses of limestone. The larger one extends northwest along the shore of Nitinat Lake for 3 kilometres, directly opposite the Nitinat Lake - NW showing (92C 011). The limestone, up to 500 metres wide, is part of the Paleozoic to Mesozoic Westcoast Complex and contacts Westcoast Complex diorite and granodiorite to the southeast.

To the southwest, 700 metres, a smaller mass of limestone outcrops along the shore over a 900 by 1100 metre area. The mass is bounded to the southwest and southeast by the same granitic rocks. Bedding in both deposits generally strikes northwest and dips between 30 and 90 degrees northeast.

The two deposits are comprised of dark, impure limestone containing some siliceous and dolomitic beds.