Gaddon Loch is south of Collessie and the A91 and immediately east of Birnie Loch.  There is a path right around it, giving good views of the loch.  There is also a bird hide, accessed from the path between Gaddon and Birnie Lochs.  The site attracts wildfowl, and is an outstanding site for butterflies, moths, hoverflies and damselflies.