The beach at Historic Virginia Key Beach Park is a constantly eroding beach due to the current off our shores. To keep the beach intact, this park uses a groin system. These wooden extensions called groins are a low tech form of erosion control. As the current constantly shifts sand, the groins help keep the sand in place to establish a beach. You can still see some of the original groins that existed in the 1950's once you reach the southern part of the shoreline.