The sheep pen Skeidarettir is situated just south of the farm Reykir in the Skeid County.  Originally the pen was built in 1881 and was among the largest and busiest after the regular round up every autumn, and also among the most popular places for all kinds of gatherings in the Southwestern Lowlands.

In 1981 the pen along with its nearby night-pen were rebuilt with lava stones with a layer of sod on top.  The walls are about 1½ m high.  This pen is well worth the short detour from the main road to take a closer look.