Dreaming of a beautiful backyard pond? The foundation of any great pond is a reliable, leak-proof liner. This TezhiIe liner is a heavy-duty 20 Mil (that's 0.5mm) thick sheet made from flexible LDPE material. The size is 13 feet by 17 feet, giving you plenty of coverage for a medium to large pond. Why 20 Mil? It's the sweet spot – thick enough to be super strong and puncture-resistant against rocks and roots, but still flexible enough to bend and shape to your pond's design. It's also UV resistant, so it won't break down in the sun, and it's safe for fish and plants. It creates a solid barrier that keeps water in and harmful stuff from the soil out. Laying it is straightforward: prep your hole, remove any sharp objects, lay down a protective underlayment if you want (like old carpet or sand), then spread out the liner. You can easily trim the excess with scissors. It's perfect for koi ponds, water gardens, waterfalls, or even as a waterproof base for other projects. Build the pond oasis you've always wanted!