http://www.finewaterimports.com/water.imports/articles/51World's Mystery Lakes
According to geological records of Alaska, thousands of mysterious lakes of all the same shape have grown steadily for thousands of years. Amazingly, they are also the fastest growing lakes known in the world. While scientists have tried various ideas to explain the steady growth - the lakes expand up to 15 feet every year - and the lakes' consistent shape and orientation, but no theory has held up.
Now a scientist who has worked previously on puzzles as wide-ranging as the spiral shape of Mars ice caps says he has solved the terrestrial mystery. The solution might also help explain a series of oddly similar lakes near the US East Coast.
The lakes range from puddle-sized to more than 15 miles long. They are shaped like stretched-out eggs, with their skinny ends always pointing northwest. They are grouped in a vast field twice the size of Massachusetts. While lakes come in all sizes and shapes, they are rarely oriented in the same direction.
http://www.livescience.com/environment/050...ange_lakes.html 
