The Natural Park of the Feather River and the Sima World is a protected natural area located southwest of the province of Albacete, autonomous community of Castilla-La Mancha, Spain. It covers a hilly terrain, marked by several rivers that have eroded karst limestone quarries and creating landscapes of great beauty. It covers a total of 19,192 ha between the municipalities of Cotillas, Molinicos, riópar, Viana, Villaverde de Guadalimar and Yeste.
The Natural Park of the Feather River and the Sima World comprises the places referred Calar del Mundo, Calar In Middle River Jets World Polje the Glen of the Cairns, Sierra del Cujón and Calar de la Sima.
Apart from its geological value quoted is of paramount importance for its great variety of flora and fauna.
More than 35 plant species endemic speak of a time in which the flora glaciations fled and settled in the Iberian peninsula, later being imprisoned in enclaves very accurate, high mountains as similar to those that make this nature, justifying the thus the amount of unique plants found there. Among the animal wealth include the endangered and Bonelli's eagles, griffon vultures, owls, mountain goat ...