Embodiments disclosed herein relate to systems, methods and devices for containing a substance within a region. In some embodiments, one or more hollow structures are positioned around the region and the structures are at least partly filled (e.g., through fill openings) with a weighting material. Some embodiments relate to a curved device comprising steps, such that a first cross-section of the device comprises a round shape and a second cross-section comprises a plurality of substantially linear segments. Some embodiments relate to a tank connection device comprising a sleeve extending through a curved device.