This is a natural land feature – actually it was a valley, until it was flooded during the Ice Age. There are many islands, channels and inlets within the harbour, and much of the harbour is shallow, with channels for use by boats. The harbour is a hotspot for watersports and boat enthusiasts, and there are plenty of quayside pubs and outdoor eating places to choose from, with spectacular views. Holes Bay is a tidal inland lake adjoining the harbour, which features the headquarters of the RNLI. Trains use a causeway to cross the bay, giving panoramic views for travellers.