The Vale is the area surrounded almost completely by the Mountains of the Moon in the east of Westeros. The Vale is under the rulership of House Arryn, one of the oldest lines of Andal nobility and formerly Kings of Mountain and Vale. Their seat, the Eyrie, is a castle high in the mountains, small but considered unassailable. The only way to reach the Vale is by a mountain road teeming with animals called 'shadowcats', rock slides, and dangerous mountain clans. The mountain road ends at the Vale's sole entrance, the Bloody Gate: a pair of twin watchtowers, connected by a covered bridge, on the rocky mountain slopes over a very narrow path. The protection of the surrounding mountains gives the Vale itself a temperate climate, fertile meadows, and woods. The snowmelt from the mountains and a constant waterfall that never freezes, named Alyssa's Tears, provide plentiful water. The Vale has rich black soil, wide slow-moving rivers, and hundreds of small lakes. Illegitimate children born in the Vale are given the surname Stone.