We need the sun for growing things and water, plus good soil. On our bicycle tour through Nong Khai rice fields, we discover a clever system of canals. The water of the mighty Mekong river is pumped up into these canals during the dry season right now. During the rainy season the water in those canals flows into the Mekong so the rice fields are not flooded. The Mekong also brings fertile sand for planting purposes. And: Get to know the Gac fruit.