Before revision: Navigation markers, entrance of Fremantle harbour and the Swan River, Western Australia A body of water, such as a river, canal or lake, is navigable if it is deep, wide and slow enough for a water vessel to pass safely.
After revision: Navigation markers, entrance of Fremantle harbour and the Swan River, Western Australia A body of water, such as a river, canal or lake, is navigable if it is deep, wide and calm enough for a water vessel to pass safely.