# Dressage 101: The Dressage Arena and 20-Meter Circles

Learn about the measurements of the large dressage arena and how to apply them to your riding.
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Though many feel confused when presented with a 20-by-60-meter rectangle surrounded by random letters, the large dressage arena is an indispensable training tool. To understand this space is to add accuracy to your figures, precision to your riding and quality to your work. In the following article, we will review the arena’s layout and prove its value by showing you where to place a 20-meter circle. With these tools, you will be on the road to better riding and be better prepared for next month’s article on figure eights and serpentines.

Arena Measurements and Markers

The large dressage arena is measured in meters—20 meters wide and 60 meters long (see illustration). It is surrounded by the letters (starting on the short side and traveling clockwise): C, M, R, B, P, F, A, K, V, E, S and H. Within the arena, unmarked, are the letters D, L, X, I and G. A simple internet search will yield multiple mnemonic devices for remembering this mysterious selection of letters. What is consistent about these markers is the spacing between them:

C and A are 10 meters from their respective corners on the short side and exactly across from each other. G, M, F, D, K and H are 6 meters from their respective short sides. R, B, P, V, E, S, I, X and L sit 12 meters from the letters next to them. M, G and H sit in line with each other, parallel to the short side. As do R, I and S; B, X and E; P, L and V; and F, D and A.

Once you are comfortable with these measurements, you can ride movements like these circles more precisely. Here is how:

20-meter circle: Now that you are more familiar with the geometry of the arena, you can ride this foundation movement seen in all of the introductory dressage tests. This circle is essential for training and testing your horse’s line of travel and bendability as well as your effectiveness as a rider.

The 20-meter circle is commonly ridden in the center or either end of the arena. Regardless of its location, you can ride a clear circle by riding to four points, as if it were a diamond. Here is an example of how to ride this figure, illustrated by a circle at C on the right rein:

1. Begin Point 1 at C.

2. Ride a slightly sloped line. Aim to arrive at the track (Point 2) 10 meters from the corner (between C and M), 4 meters past M and 8 meters before R.

3. Ride a sloped line to Point 3 20 meters down the centerline from C—2 meters past I.

4. Continue your sloped line to Point 4. Aim 8 meters past S, as you are approaching. Again, the point you arrive at the track should be 4 meters from the corner letter (H).