Geography of Scotland example at Aberdeen. Much of the Scottish coastline consists of a machair formation, a dune pasture land formed as sea levels subsided. The east coast has several significant estuaries and other nature reserves including the Ythan Estuary and Fowlsheugh, both of which have been designated as Important Bird Areas. Firths of Scotland include the Solway Firth, Firth of Clyde, and Firth of Lorne on the west coast, and the Cromarty Firth, Moray Firth, Firth of Tay, and Firth of Forth on the east coast. The Pentland Firth is not an inlet, but the strait that separates the Orkney Isles from
Firth of Clyde Common and grey seals abound in the firth. Harbour porpoises are also common and while dolphins are much less so, they have been spotted in the upper reaches of the firth in the summer of 2005. Whales do not favour the Clyde and although there have been instances of larger whales beaching themselves or becoming stranded in the upper firth, only smaller pilot or minke whales seem to visit with any kind of regularity. In 2005 the firth was listed as having the 2nd highest incidence of basking shark sightings in Scotland (after The Minch). In particular these huge sharks