Wentworth Falls Lake is a peaceful lake reserve just off the Great Western Highway in the upper Blue Mountains. The lake was first built to supply water for steam trains. A mostly flat walking loop of about 3.7 km runs around the water, past sandstone sculptures of native seed pods, with plenty of ducks and swamphens along the way. The reserve has a picnic area, free sheltered barbecues, public toilets and a playground, so it suits a relaxed lunch and a gentle walk by the water.