Abstract: A floatable aquarium accessory formed to resemble a natural rocky shoreline setting. The invention provides a stable, landscapable, and functional terrestrial surface within the aquarium into which it is inserted. It moves vertically in response to changes in the water level of the aquarium while lateral movement in all directions is restricted by close contact with the interior side walls of the aquarium. The invention conceals the aquarium's water filtration system within removable enclosing members which also resemble natural rock formations. Additionally, it supports the system at the proper position in relation to the water level of the aquarium for its normal operation. The upper terrestrial surface containes a number of depressions for holding aquarium gravel and terrestrial plants. The outflow of water from the water filtration system may be diverted over its enclosing formation.