The Manggahan Floodway is a water management system located in the Philippines, designed to control flooding in the eastern part of Metro Manila. It channels excess water from the Marikina River to the Laguna de Bay, helping to prevent overflow during heavy rainfall and typhoons. This floodway plays a crucial role in protecting communities and infrastructure from flood damage. Constructed in the late 1990s, the Manggahan Floodway is approximately 3.8 kilometers long. It features a wide channel that can accommodate large volumes of water, making it an essential part of the region's flood control strategy. The floodway also supports local ecosystems by maintaining water levels in surrounding areas.