A shack is a type of small house that is in disrepair. In Australia, shacks were originally holiday homes located on crown land such as along river banks (especially the Murray River) or near beaches. They were roughly built as they were likely to get washed away in floods, and had no legal title on the land they were built on. Now, a lot of the shack owners have freehold title to their land, and are subject to building codes to reduce the risk of damage or injury from floods and storms. Many are now quite grand holiday homes.