Eheim LAKE Pre-formed ponds are a range of high-quality, sturdy preformed garden ponds. They are suitable for use both as fish and wildlife ponds or to create a water feature. These can either be sited in the ground or used (with some creativity) on a patio. Eheim LAKE pre-formed ponds have been designed with convenient shelving areas for plants and are deep enough to over-winter fish. 4 different shapes and sizes are available.