Our ring is not quite full Advanced size of 40 x 100 meters, just didn’t have the room in that field. Still a really good size of about 30 x 95 meters, and allows you do do almost anything needed with driving and large horses. We usually drive Multiples, Fours, Tandem, Pairs, so having enough length and width to ACTUALLY let them move out is wonderful. Not ALWAYS turning because those corners come up quickly.
I would suggest making your ring square, so you have corners to use or not, if you like. We do make a number of small circles in the corners at times. Horse/s get more adaptable if you should need that kind of turning someplace else.
We have an edging on the ring, railroad ties, that keep the sand INSIDE and give a feel of limit, without the visual “wall” that fencing does. A lot of horses depend on that fence for limits, while others never “QUITE” get really close to the edge of ring as needed in Dressage movements. We do put up some plastic chain before any CDE, so our horses get to look at that, not be wary of it blowing in the wind.
As a user of this ring, I just love it for the open feeling. We can gallop, ridden or driven, horses have enough room to go as asked. Works well in conditioning, using all those other muscles and breathing to develop their wind. And with BIG horses, mostly 17H or so, they are not always turning or hesitant like happens with smaller rings. Lets you ride, drive, develop control as horse gains skill.
When the kids were riding more, we could split the arena, both kids working one end, out of each other’s way. I could set up a nice course of jumps, using the whole ring, so they actually had space to rate and extend their animals with good turns, not all crammed together, as horse and kid learned skill over fences. The speed rider taught her horse the needed patterns with MANY repetitions at walk and trot, before she could do her speed runs with horse being extremely consistant in his runs. Not using fences to do his turns, since he didn’t learn that way. For such a big horse, he did VERY WELL in barrels, flag race, poles, over smaller, faster horses that were not consistant, controllable as he was. Benefits of the big, open arena training.
Ridden or driven, our horses have learned to wait for instructions in the no-fence arena. You really can’t have “too much” space in your arena!