Gloucestershire - Purton Ship's Graveyard. Click on a picture for a larger display or Slideshow button (right) for automatic display.June 2022. Tewkesbury is a pretty town on the banks of the River Avon where it meets the River Severn. It is probably best known for its impressive Abbey, dating back to the 12th Century. The centre of the town still retains many of the old buildings.