This is an interactive map showing the most well-known of all leylines, St Michael's Leyline, The St. Michael's Ley, or the Saint Michael Alignment. The line aligns with the path of the Sun on the 8th May, the festival of St Michael.
There is also a St. Mary's leyline that is not as straight but follows and intersects with St. Michael's Ley. It is described in the links below. You can zoom in and see if your location is near the Saint Michael ley line using the map or satellite view.
The lines are curved to follow the curve of the Earth's surface (to be more accurate).
The energy is said to extend 40 miles each side of a ley line.