The Lomas de Lachay (Lachay Hills) is a national reserve in the desert foothills of Huaura Province in Lima region of Peru. The reserve is located 105 kilometres (65 mi) north from the capital Lima and features a unique mist-fed ecosystem of wild plant and animal species. It expands across an area of 5,070 hectares (12,500 acres).The hills are a result of a combination of coastal climate factors, and subject to a peculiar geography called the Yungas.