Newark Castle is situated about 6km west of Selkirk. You can see it from the walk up to The Three Brethren, which we did a couple of weeks ago.
If you start from the castle, walk west along the road and then head up into the plantation you’ll find yourself on Duchess’s Drive, which leads up to Newark Hill, on top of which there is a cairn.
15kms to the east are the Eildon Hills.
You can continue to follow the track to the top of Fastheugh Hill (501m), and then turn eastward through the forrest, coming out at Harewood Glen. A good walk.