This easy walk visits Harlaw Reservoir, near Edinburgh. The site is located near Balerno, about 8 miles south-west of the city centre. It's a lovely, peaceful area with nice views of the surrounding Pentland Hills.
The reservoir has a nice 2 mile footpath running around the perimiter. You can park at the visitor centre car park at the northern end of the water. From here it is a short stroll to the footpath which runs through the waterside woodland. You can extend the walk by heading along the footpath to the adjacent Threipmuir Reservoir.
To continue your exercise, simply head to Balermo and pick up the Water of Leith Walkway. It's a great way to explore the city on a well surfaced cycling and walking trail.
If you'd like to continue your reservoir walking then you could head towards Livingston and visit Cobbinshaw Reservoir where there's some lovely views and wildfowl to look out for.