Start at southmost point of the northern entrance splay of the layby S side of A40 immediately S of Llanwrda (OS 146 GR711312). Proceed SW on A40 to Llangadog r/a (2.5 miles). Take 2nd exit (straight on) (CIRCUIT START) to continue SW on A40 through Manordeilo, Rhosmaen to Llandeilo r/a (7.5 miles). Encircle r/a taking 3rd exit to continue NE on A40 via Rhosmaen, Manordeilo to Llangadog r/a (CIRCUIT FINISH) (12.5 miles). Encircle r/a taking 4th exit to REPEAT CIRCUIT (via Manordeilo, Rhosmaen Llandeilo r/a (17.5 miles). Encircle r/a taking 3rd exit to retrace on A40 to Llangadog r/a (22.5 miles)). Take 2nd exit on A40 to continue NE past Abermarlaes Caravan Park, passing Brownhill Farm junction to pass opposite Start point to FINISH at mark on roadat slip road to Llanwrda and approx 200 yds before A482 junction (Lampeter). (GR 712313) 25.13 miles