Nag's Head Island is an island in the River Thames in England at Abingdon. It sits in the middle of the two Abingdon Bridges on the reach above Culham Lock.
The part of the island on the upstream side of the bridge is occupied by the Nag's Head public house, which gave the island its name, a nag being a useless horse.
From the top of the island here a daily river boat service to runs to Oxford.
Wikipedia https://en.wikipedia.org/wiki/Nag's_Head_Island
Coordinates 51°40'5.95" N -1°16'47.68" E
