aerial photograph of Burrow Mump Burrowbridge Somerset England UK. Burrow Mump is a motte castle on top of a natural hill with the remains of an 18th century church on the summit. The site is an ideal defensive location overlooking the confluence of the River Tone and the River Parrett. The natural hill has been reshaped to form the motte with a flat base and berm at its foot. Showing clearly in the photo is the course of an access trackway which leads up the hill. It stops short of the berm and the final access to the castle would have been on foot. The site is covered with strip lynchets which probably resulted from medieval farming after the site ceased to play a military role. The church on the summit was constructed in the 18th century but never finished.It replaced an earlier structure of uncertain date which was recorded as having stood here in 1645 when Royalist Troops occupied the site and held out against Parliamanterian forces for three days.