In 1911 the rivers abounded with salmon and trout, and the pearl mussel occurs in the Ythan and Don. A valuable pearl in the Scottish crown is said to be from the Ythan. Loch Muick, the largest of the few lakes in the county, above the sea, long and broad, lies some southwest of Ballater, and has Altnagiuthasach, a royal shooting-box, near its south-western end. Loch Strathbeg, southeast of Fraserburgh, is only separated from the sea by a narrow strip of land. There are noted chalybeate springs at Peterhead, Fraserburgh, and Pannanich near Ballater. Other lochs of note are Loch Kinord, Loch Davan, Dubh Loch, Lochnagar, Sandy Loch, Loch Callater, Loch Phadraig, Loch nan Eun and the Loch of Skene.