Kettuvalloms can be as large as 80 feet. They are made from the wood of the Anjili tree. The planks are bound together using coir ropes and coated with a black resin. Nothing can match a stay on a Kettuvallam. These giant boats float on placid waters, rocking slowly. They are slow, calm and environment is peaceful. Many of these houseboats even have solar lighting, chemical toilets and outboard engines.