Pentland Firth

Pentland Firth is the strait between the Orkneys and the Scottish mainland connecting the North Sea with the Atlantic, 12 m. long by 6 broad, and swept by a rapid current very dangerous to navigation; 5000 vessels traverse it annually.

Definition taken from The Nuttall Encyclopædia, edited by the Reverend James Wood (1907)

Penthièvre, Duc de * Pentonville
Pensionary, the Grand
Pentacle
Pentagram
Pentamerone
Pentateuch
Pentecost
Pentelicus
Penthesilea
Pentheus
Penthièvre, Duc de
Pentland Firth
Pentonville
Penumbra
Penzance
People's Palace
Pepin the Short
Pepsin
Pepys, Samuel
Pera
Peræa
Perceval