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Harlaw Reservoir is a popular spot for outdoor activities including walking, fishing, and wildlife watching. One of the highlights is a small embankment on the far side of the reservoir which offers stunning views of Threipmuir Reservoir. On weekends visitors you can get your hands on some homemade crepes from a local van parked near the Harlaw House Visitor Centre.

Often busy with dog-walkers at peak times

This is a great bike section with a nice approach over the bridge and causeway of Threipmuir Reservoir that has great views over each side. Exponential Hill itself is a beautiful tree-lined avenue that is very scenic. The section itself is only 462 metres long but has a sharp 49 metres of height gain. A stunning place overall and a nice hill section to take in on the way to Bavelaw Castle.

Pretty steep uphill from Threipmuir to Harlaw. Easy enough to walk up/down.

Threipmuir Reservoir (west) & Harlaw Reservoir (east) where built in the mid-1800s to increase the water supply for the Edinburgh area. Both have great lakeside trails for a flatter run in the Pentlands.

Harlaw Reservoir was constructed between 1843 and 1848, at the same time as the larger Threipmuir Reservoir upstream. It's a simple gravity earth dam construction that adds to the volume of water available for Edinburgh.

Great views - well worth the climb up (525m)

The tracks at Harlaw are all gravel but up to this point is fine for a road bike.