Île de Térénez is a French islet inside the last bend of the river Aulne

Aulne

The Aulne is a 140 km long river of Brittany in north-western France, flowing down the hills and emptying into the roadstead of Brest, one of the many fjord-like bays just south of Brest. The river is part of the Canal de Nantes à Brest, the navigation canal that once connected the city of Nantes...

, on the territory of the commune of Rosnoën

Rosnoën

Rosnoën is a commune in the Finistère department of Brittany in north-western France.-Population:Inhabitants of Rosnoën are called in French Rosnoënais.-References:** -External links:* *...

. Its highest point is 18m.
Covered in woods, it is accessible by dry land at low tide and faces the Landévennec ship graveyard

Ship graveyard

A ship graveyard or ship cemetery is a location where the hulls of scrapped ships are left to decay and disintegrate, or left in reserve...

 and Landévennec Abbey

Landévennec Abbey

Landévennec Abbey was a monastery in Brittany, now in Finistère, France. It existed from its foundation at Landévennec, traditionally by Winwaloe in the late fifth century, to 1793, when the monastery was abandoned and sold. In 1950 it was bought and rebuilt by the Benedictines of Kerbénéat.It...

. The corniche de Térénez, running along the right bank of the Aulne for 4 kilometres, leads to the pont de Térénez, located 2.5 km further upstream.