senior trekking group, Bassa d'Oles, Montcorbison, Aran Valley, Lérida province, Spain.

ACTIVE LIFE • ACTIVE TOURISM • BODY OF WATER • CLOSED SEAS • DECLINE • DEEP • DRINKING WATER • EFFORT • ELDERLY • FLOOD PLAIN • FRESH WATER RESERVE • FRESH WATER • FRESHWATER • GEOLOGICAL PROCESSES • HEALTHY • HIKER • HIKING • LAKE • MATURITY • MIRROR • MOUNTAIN RANGE • MOUNTAIN VACATION • MOUNTAINEER • MOUNTAINS • NATURAL BORDER BETWEEN SPAIN AND FRANCE • NATURAL RESERVOIR • NORTH OF THE IBERIAN PENINSULA • OLDER PEOPLE • PERMANENT SURFACE WATERS • PYRENÉES • RAMBLER • RANGE • SEDIMENT • SENESCENCE • SIERRA • SOIL MOISTURE • SPORT • SPORTS • SPRINGS • STAGE OF THE LIFE CYCLE • STAGNANT STREAMS • STEPS • SURFACE WATER HYDROLOGY • THERMAL INERTIA • TOPOGRAPHIC DEPRESSIONS • TREKKER • TREKKING • WALKER • WALKING • WATER BODY • WATER TABLE