Based on the picture, it is located in an outland terrain, with floating and nonfloating big and small red rocks (you can place/build towers there), and a pure black tar (you cannot place towers there). There are two paths that bloons intersect each other two times, doing U-turns. The length of the blue path is shorter than the skyblue path, that's why you need to focus also the blue path. Since there are two paths intersecting for the bloons to appear, best to place there are useful and effective towers, such as Boomerang Throwers, Ninja Monkeys, Tack Shooters, and Ice Towers. Unlike Lava Fields in BTD5 versions, bloons will loop one time and do one U-turn as it intersects each other. There are cliffs in this track. No water.