Eforie Nord, 14km south of Constanţa, is a honky-tonk seaside resort, free of pretension, where families come to soak up the sun on the beach by day and gorge on junk food by night. That said, there's another reason for making a detour here: the amazing mud. Lake Techirghiol, within walking distance of the centre of town, is famous for its dark sapropel mud.