We 've beein to Bewl water yesterday.
It is a reservoir in the valley of the River Bewl.
Work began to construct the reservoir in 1973 by damming and then flooding a valley. It was completed in 1975 having been filled with over 31,300 million litres of water. It is now the largest body of inland water in south east England.
It is largely used for water sports and family activities.
But off-season it looks rather mysterious. Gives you some sort of the Twin Peaks movie feel...