What is the fine-grained topic of the following text: As Chattanooga, Knoxville, Decatur, and other towns along the Tennessee River are doing or have done, Huntsville, Alabama has started to develop its River front and we have something unique no one else has+óGé¼-ªA 2.5 mile long x .5 mile wide island. Only return the topic.
Huntsville, Alabama's riverfront development and its unique island feature