English: This pair of natural-colour images shows changes at the Yellow River Delta river mouth over the past two decades. In 1996, Chinese engineers blocked the main channel and forced the river to veer northeast, delivering sediment to a new location. By 2009, a new peninsula had formed, the old one had retreated, and shoreline northwest of the new river mouth had filled in considerably. The filling-in of that section of shoreline may be the outcome that the engineers were anxious to achieve: the land northwest of the newly fortified shoreline is home to an extensive field of oil and gas wells. Their protection is a primary concern.